Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845f9b24159498b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-10 08:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17ea5e0898c7e814baad901916ba22f6 SHA-1: 96752b86da168bb37906e4d063221d63768af587 SHA-256: a845f9b24159498bfea8d402c64efbb1ed241b19e01339c5bc7eeac4e674a781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2125680f4f57d7545ee76b822af63c4c/99697724960.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0tp7l4fu2rke0i02p1diu3083/49941672240.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7b054a1eb---13689713042.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tldka1no9p05ol3ddh0gs8uumb/12871450540.pdf
    • http://www.medicellbank.com/userfiles/files/97513516372.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/38e1e00dd639d619832b90540433af67/zabadovunisuzisozoxag.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/753fff6e1847fb5d36fee083475dac15/58672364122.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9093cccf2c---29867608600.pdf
    • http://luckdidea.com/ckfinder/images_store/files/vewuwimifilutevejadavetar.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7cc4c1e2---kiboxavosajutelotifuwuzuw.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c69f50b0d066e17e740802e52d66dbe9/31200382436.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e46jh2ne29tkt9ssgqk8bbins4/37538308765.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6b895acbece54c05c25b4e36d77b02f6/95562051112.pdf
    • http://findmecakes.com/userfiles/files/robomuxegosakirarodor.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f9ccff9b4cd7b3f86fe00c705b6d6f29/zeroxawoteto.pdf
    • https://sklep-pinokio.pl/web/uploads/files/58124284789.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/jezak.pdf
    • http://hieuchuan.com/upload/files/43691023528.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758175da147---13491249194.pdf
    • https://securitydm.com/slicice/file/zaramiw.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22b7478f5---vopaxaniposiwa.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ba87bb14---97404357821.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=data+structures+syllabus+for+gate
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f637.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
font_01_sfnt_off00010e49.bin
2f44a2c1e1a586cbaba36ec5993245c23278d6963d56415e6087b3dfe7f47eee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 17560 bytes
font_02_sfnt_off00013cb6.bin
830253745e88fbd292f9ad51067e8a0a2b3f0fb8982026647e9e6e8494eb52d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 10672 bytes