Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7f701a1ff64ed0…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 04:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da49c1b7873c8b065202084b34d801af SHA-1: f476880f54f4496f0eea6a323991317e249f39f9 SHA-256: 3a7f701a1ff64ed08f6abedc14d4b33938561fdd7237df7f80e9c8c8214ba2db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://kaptenhoki.net/contents//files/36068166353.pdf In PDF document text
    • http://drshapard.com/clients/73598/File/15959842054.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb665fb9726---jisuxutasupajexogunewa.pdfIn PDF document text
    • https://airshow-bg.com/file/xupopilesavami.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607932d83b8d3---9149216706.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/boxenoserezede.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t8cvi2f6p8sppvip9tr3tjgo84/puxuzup.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/84821984035.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6j6q6lnh7t3nrpjc0qftpsgri8/kesekisivutejofe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v8tr521fvd14v0q9k72ni8sjk0/xemedewosinomifofujomefu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944181ab504---22854810557.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a73a4f80e---tigamodenosagituvar.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eadd0536b---ruzumelu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607702a1a4a45---nekofimuvuruximeregokitu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/02ebbf1ad40621c99904c266bfe7787f/54006666069.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/34266488777.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/pixibenopebijuvi.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/86853747061.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c39ad1c3---lofexosoragadujuxi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/negevales.pdfIn PDF document text
    • http://redactron.com/userfiles/file/56764489770.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/14479211804.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/535e874d6e10a110e9404600a251481c/71199903563.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a2fce72842c8849dd6f1bd31b1a9ea2/38745496734.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/56234493301.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/nexusimud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=black+and+white+newtPDF 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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10312 bytes
SHA-256: 25ff84ddce999cb2a42dcee985976f354f300fc3662b5c3878631587f94f9c2f
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 16764 bytes
SHA-256: 161bad4951c747f122f9d2d62387c433ebb81f0a449c8f1d3988157e8bb729f6
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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