Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3faca1dd372a3af…

MALICIOUS

PDF

111.4 KB Created: 2021-07-22 14:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f71b17c2ca69f120144f0a3804da4fa7 SHA-1: 755c9ab9cda85e3dc0560410a15c3ebb6fc20e32 SHA-256: d3faca1dd372a3afb1aff989424abae14470b548d31beb2db0c8e2f49e922a22
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs associated with compromised CMS uploads and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://magooferta.pl/uploads/fck/file/wekegisowigotexijugozoli.pdf In PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/13456745259.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/jikaxovetivizatenivov.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/27aac120c8f351e90c1e58ec64c77505/lanotepukupejifoxeva.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/tujovamog.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd3a13f772---pitavapep.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/41013502865.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b948aba9b1---60377834579.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nadakisoguxugubizefubet.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/47802352113.pdfIn PDF document text
    • http://reflita.lt/uploads/files/dijurimitisozebepupegavib.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/rupimumove.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986163358f6---86350386987.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59346808454.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdac3d07a---84299673221.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add77d1bb47---kuludejuro.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zididinaxuzovet.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/aeb7dbe76e914343208dc4ecfc4afecd/25937762875.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/988b97946d325a68fb46f9bd3e27fff3/xovafureviwebubaliduwum.pdfIn PDF document text
    • http://ridendo.cz/files/file/rugunefaku.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db1c0ea3a---kebikiluguxezet.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xujedagi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a62bff18---jobureximo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/rumofekukawisugabidij.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m5d2q7eq32dtt3botn4usmbi90/17911557889.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/jikip.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/70qaikuk0u79r8m0jhg4alco2g/rovonagavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=all+today+soccer+results+and+live+scoresPDF 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_off00014e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0D 10624 bytes
SHA-256: 4a6be736fd616aa46114f6f7a0a552acbffed165ce1b28e54b84ddb525e0e717
font_01_sfnt_off0001667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667F 18144 bytes
SHA-256: 768b2d62012fd5f2a9c6102957faa6bbbde0f6dd90772c7b44c29787e928d1d2
font_02_sfnt_off00019632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1