Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c45cf747d2ac74…

MALICIOUS

PDF

91.3 KB Created: 2021-07-20 21:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f942bf192b114e0e9814fd273db81243 SHA-1: 9495d803fc6fe468b822a9c50755d9a2de9ba45c SHA-256: 79c45cf747d2ac7446cce9e91fe5ba0a6cc7a14d67e607826064c81921e79a11
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of many distinct hosts and the use of UTM parameters indicate a potential SEO manipulation or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4dbd1181117808fdeab5ac57bd0c6ba1/jibijubosadosumexu.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/png23ep1c8tbc0u9mv61otkai3/samizejeluxulimiban.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sosires.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904c8cd39e5---53311590686.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hkuiki3vtdl03jpjhmiuepg4g2/darujifajunikatu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nuwiluwe.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/45534354514.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb30dab094---51027006358.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/2419598637.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/xarojalivagebem.pdfIn PDF document text
    • http://dsagco.com/Upload/file/fijuzakebixuzojededisusi.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xarobot.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/19735639856.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878aa3d70fa---pupajewovisune.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a777ca92---vekodomaranotoloxopaxop.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3c26a0951369875e37fe2776f14fadf4/rizejikovotosalatuvoteg.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/83815482052.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/torip.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/756d22c6cd92f2b14e37dcabc71edb47/60138036951.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/rezadevekalifuwixu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/25408656734.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a604dbf1ca2---susabujede.pdfIn PDF document text
    • http://rts-3.ru/upload/files/95317162054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=going+down+like+the+titanic+songPDF 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_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 10764 bytes
SHA-256: 3940bc20e17d3321199ee1d48fc11fc0ea905c310f69d221ca0558152e22594b
font_01_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 18252 bytes
SHA-256: 7cdeadf3735095cff091c362ec07111ec808038ccd26607a75467efadcd33508
font_02_sfnt_off00014802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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