Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb19a9ec89f5d6…

MALICIOUS

PDF

175.8 KB Created: 2021-06-26 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 235a740253aba366545e033532736b7d SHA-1: 1285e55fe3a6b3871ef62a552625080e408adbc7 SHA-256: 71fb19a9ec89f5d6ce6ecdf148ba4c4b95fda91cb5cfb3f64c7c7c1f6078cf34
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple heuristics indicate a phishing lure, specifically impersonating Apple. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 8

  • 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/GLLx1DTH0VQ/uplcv?utm_term=laurence+tribe+impeachment.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1d505046---tiguzudumanesomi.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lebebesu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177db80665---69379629222.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/cd5708fbf8f99e36e529d6baf3134ada.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/bemuzororogemazir.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/brjqq2dcvqlj6asifqt2tognrk/ledatogisagalimizosigasu.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wasopodux.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9236444d---kolidoxugevevepulojiko.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tneptesoimqq9cm32kd1rf0ikj/taposupudibo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fb9e5e5693aa4ae17d4c36aef2d4b299/nutuwigomawidovog.pdfIn PDF document text
    • http://elm3rad.com/file/gufuxefe.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/56783718798.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ic83kk5pj4fh4ah9mnl0hc4dqb/weladugavorawekurozejox.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bc29d4df---77685044456.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/71984240114.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed64a15692---49997997055.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/56849116983.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/sunaxiranexedekemukolapes.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f49359b4a---zonijatutuwikojafozilo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/71551338697.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a534de3841a---40117374525.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/10108906329.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fbf9bf079cd0cfb1f5160e71a7432eda/fejilemoninega.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210609075319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=laurence+tribe+impeachmentPDF link annotation
    • 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_off00025357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25357 10500 bytes
SHA-256: c49eb468f628e89a1567bbda39c8f000d26137ca9c9748a2e89df3e873b63d39
font_01_sfnt_off00026ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000282d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282D9 18044 bytes
SHA-256: 68b1ed5ea7ef6e83f6b810c54f54de7e6ed0e11635b397d45d65885e2a865f04

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