Malicious PDF — malware analysis report

Static analysis result for SHA-256 42432aa9b772c2c7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 18:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7442a301c2a9e2a1f60dfbb4241932b6 SHA-1: ff2983c4e60964e70d215a3749bc8a6fd225e592 SHA-256: 42432aa9b772c2c75b8dbc1369dfb671da50f5af8b94e4baf9b600411a44ca00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The primary goal appears to be luring victims to malicious sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=the+coase+theorem+states+that PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a3k1bu01kl6oqpgq2pmc3bu5cn/zomafanira.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/7654620228.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/xexezezomufimugolobarebul.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1f12314c---25256793922.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096b29961a0d---47919446666.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8f1o3kclg6cjrrg4lbdrvtt1a3/21189827559.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1072878515---mubitaxe.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dda9febd3eb6277382d5027247e65f53/19326655222.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/kuzudogul.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/84a64b555caac17bb472384874e7365d/62532625815.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/rigagevaxi.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/40192579836.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987c8b09219---nasubifolegisagez.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/61293031897.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e65834ebf---80515951443.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/87309387043.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lulenu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612871ad75909---69789172104.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rf46nh1a2u3i05gvfnsc9867mo/68961097751.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/36200188524.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/rudinajatumido.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/ledazeluf.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ff8c187fa41de8bfa4c46ddd62808f98/jagalojebasebupinawometi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087535e056e9---tonanipiwujipevosi.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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 18848 bytes
SHA-256: cf083ee3135c0f617946a7c2025140bee58e15c59d00a7d39829ced4ca7ce366
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 10216 bytes
SHA-256: 1ef5e8a48c6b7c0b212599a813bfd2d2c8f43bb7836333030aa89a165a5f3d48

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