Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a76b8a4812b34e…

MALICIOUS

PDF

115.0 KB Created: 2021-08-01 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 225c6b5fb0271b216a6263025e57c9d1 SHA-1: 219e583b5a462c0cb888d99d135b9412404f1bde SHA-256: 80a76b8a4812b34eef12635c624fa012c263104a38044f2b8fd213f93e3b2081
156 Risk Score

Malware Insights

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

This PDF file contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs point towards a coordinated effort to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://allytemp.ru/uplcv?utm_term=cremas+para+la+cara+despues+de+los+40 PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nku2q4ldk3rim3bvm4blgmr5s1/sogubabunivasatotud.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cff6ae34717---vufekadamita.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/00qcodumgj25o2gdvs9a27v675/jozaxawuduwu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2qp9opc0e2a3vripis731ms60m/xutigetozejumig.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/11bii2s99so3idsrlfl6ubsvcb/juminafudegojavigujoroxap.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6baaca801e---fuzusav.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/tuvixetilozunajususilifi.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81131953184.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2496788390.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/zusejosijo.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/betepokin.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/megakuzotesep.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/62449783102.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/6144067855.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95428eac9---pirarabatosadivemopek.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/23961773669.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/efbf9db10300435792a068f768607600/nekiwivamixolube.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fbabef18716---zepukudoviwizube.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/rimelemuxew.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd462db8019---sifobadaromofinifuzedit.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/81719876997.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/pogarelubuvarawiko.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6fe31f4---55798731141.pdfIn PDF document text
    • https://norservis.cz/files/files/vesibixemaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 19332 bytes
SHA-256: b1fb48e37d73e073b3530a06ab7219ab54293fe529246a4b02d695af2a703fe9
font_01_sfnt_off0001740b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1C 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off0001a245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A245 10712 bytes
SHA-256: 0f882629bdfc33c261985f04cca711cb833241aa3986cc820d8c010a04c5ab51

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