Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59c411f110b6404…

MALICIOUS

PDF

89.9 KB Created: 2021-07-24 20:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3aa539f4749cac8d6925feb607893841 SHA-1: fb653e44d972ce33c2d830be4952114b583d2d69 SHA-256: e59c411f110b640410187588abe8ebf9dbbd4ff0fd73e31e3b41325c25d66792
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+robux+gift+card+codes+2021+april.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53601c26eaaa4d070e0d812e9e051d06/nekadaxiganoseson.pdf In PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/juzesogaweku.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee91ff9f675---fojar.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/89456361367.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/82501646244.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fb04dc32d6ecc63b7500626510e063f9/losutuludelibi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8sartq2c3m6q6bets1ugg4r758/lagurumujujame.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zavukedumarina.pdfIn PDF document text
    • http://wwstationery.com/files/file/15284581673.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/30449231639.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31b2a79eaf---18075439226.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e4af2f55ada6b706014830cda5928f69/tumuvuguwamufavudon.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gd5m35si37f5gf0891nps81duk/josopapakawese.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2875d624---32933712151.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/62003772518.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/82cf99af311730768bc7ab19e32208d4/vebumobujilapidug.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b62a38642---25928273109.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013e49e8ea---tupubezimevewe.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/wiwafavafoguxe.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/rujiwixalonedi.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/josejaxe.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/xamugabovibazuvesexitiles.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd253398b---solezutetewebureronunuzag.pdfIn PDF document text
    • http://falerisztika.hu/tmp/80239479395.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/40b5da550d5a49de9caf36192014c24e/xipazowaverupujura.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/45426539250.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/guvixigerokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+robux+gift+card+codes+2021+aprilPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/11385161348.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17720 bytes
SHA-256: dfebbf20f336edc6951f1cee056b67e6e7ebad0c7300a40d70b43fe722f70dba
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 11304 bytes
SHA-256: 894d3e7745b6f788bf3b6e3abfa61266ce4920be94291ab78f7f511966faccab
font_02_sfnt_off00014197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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