Malicious PDF — malware analysis report

Static analysis result for SHA-256 271fc5c54dca76c6…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 18:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b9e03f5beb0fed5e630ad3248274218 SHA-1: d5d705104dc098e77344ed287ed6057fe4f5114e SHA-256: 271fc5c54dca76c6ba12bf07f39b312f226971e27da26b8c62ef1ac95bb391d6
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a focus on hosting links on potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89c97c1b7---37119128596.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/734d6e50d53a49088e85729cf4a114c4/luregigemufevozedorudek.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ae7c33b9c35f7e1e1f11e128f7e3e307/lotelivamozegalozazij.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0b2fec0bfc4ac809ba9f45cd2602c6c/25850353400.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/35328849237.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kewekam.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xobolago.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/pumerotufovumin.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/93188760037.pdfIn PDF document text
    • https://efnnma.org/files/file/60935500800.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c227b9869b4---zerovotigogaf.pdfIn PDF document text
    • http://remobudostol.pl/pliki/lolulalibixekuv.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/26454000381.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c9f27807---4065334039.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vgk3dfgve5k8ppr8po4qchkmj4/54242568992.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/joferizoduxo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/prlfbqj81c8b29okkc5hfv0kft/fijusasaxiziwoporonudil.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9bdddee4a4412546e6aedaddc6ae22ff/5750380976.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50d1ebf095---92031550480.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/paiui6bbvt9j4m006kuthq7hdn/dovek.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a52436dd9e4---7495313971.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wazifaxijebawetek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=different+types+of+blue+jaysPDF 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_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10836 bytes
SHA-256: 276d8c124e285fea4edb003403ea2639c093ef4334231ee029e81a4fdb4aa28a
font_01_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 17096 bytes
SHA-256: 744b64296fb15ee4488997b3a5a3df0744ee066ec5b9ed12f70909227fb53501