Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc05bf6890fae20…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17976138a97c1a066a28a407072572b0 SHA-1: 7b6646409869d5c71275a73bc8cc87e6f1af74c7 SHA-256: 9bc05bf6890fae206c414906380b32d4846583ea806a1b1d07237e828ec7aaff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of external URI links and the overall structure suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=ase+test+question+and+answers PDF link annotation
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/64719189294.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/watalo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107221045426190.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/dusaxibutedor.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3e3ef526eac8ebf8f6418f382e1f359a/77370945823.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/33058382728.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/refeniwe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a501a38d83a---89099357622.pdfIn PDF document text
    • http://cl-pub.com/files/files/39776697249.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458c6a7a8c---jawifudinikigerufijisa.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tevodetidubewawepabeber.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/bilam.pdfIn PDF document text
    • http://bakoca.hu/files/file/poziwuketojewujel.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609821b6729c9---72677367781.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/61879336286.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/bewamojorupososidike.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/157311d45c07205116fdc893d8f2fb1f/runibebesobilexoli.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98713713986.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/54151707207.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6df35f25---18081390131.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/1014010028.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/da4a5f47988097a5080ddf95325b4a2b/66929782561.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10508 bytes
SHA-256: 15bde2678ab5136e3960f11cf54de18e0cc48d913d6c8f0bbc9b425846081e76
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 21812 bytes
SHA-256: 9de2c0e1bd5bdfc5f642f277802e606dab304f7c1e8a4ceaae217bd480e83886

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