Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadec9da22b4ad13…

MALICIOUS

PDF

69.1 KB Created: 2021-09-01 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 333e7e047936266d46331a3b8cdc1bd0 SHA-1: b9c60ae71e3d86fbf77751e03e59595e05d60e9c SHA-256: dadec9da22b4ad135e42a0d80465fed3329c5d0d471c273cef6be578b5fa6091
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to various compromised websites and disposable hosting. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://laborke.ru/uplcv?utm_term=scramble+up+meaning PDF link annotation
    • https://vasantviharproperties.com/userfiles/file/61209816590.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a41822b902---zeterej.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/88854092242.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/rosomezolotivarizuzu.pdfIn PDF document text
    • https://agatanorek.com/files/file/35075665327.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99fc64a135---datugi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xufidotemebuluz.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/digezoboraladediw.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ceb394abc4bc335cf5420c52b34ea3c0/ruwesididi.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/43348965764.pdfIn PDF document text
    • https://signika.pl/Upload/file/vijisidixajewupufox.pdfIn PDF document text
    • http://uteambio.com/upload/files/kedovek.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc900da4076---45959611256.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/nevipamex.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tdj4vvfifkodm6perjfvtfenv2/90523521233.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f04c8673f---sudijulufuromumutekuto.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/6830072496.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/83743108546.pdfIn PDF document text
    • https://udruga-invalida.hr/files/27451536463.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/82b6b4c4808403b274b353c27ce428a5/19203517968.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///zesavozof.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610f97d9be---kujegesusesomivexuvam.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd527942d---denixeb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/40840433226.pdfIn PDF document text
    • http://wdnederland.nl/file/94623361583.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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 10644 bytes
SHA-256: 1954d3e4e7e6843e442f1dfb38f7ef31f9c504af5e6539a91abbe7f26cf57ea6
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 14064 bytes
SHA-256: 497035651114cc3479763c004dffff15a62e6f18d34a457cc27cb25def0b6d8d
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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