Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a62441fbfb0ebe…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcc54dd3250cfbc92b87abd5cadaf8ed SHA-1: e4b05dfc278ab40012193c947e95e9d5ccfc924a SHA-256: 79a62441fbfb0ebef82f70686835beb619e2d65d1340b0ef6c7c9f594bf7a3a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c61946845---64897222074.pdf
    • http://appartenvue.net/appart/upload/images/pigovarufumog.pdf
    • https://walkandsmile.com/userfiles/file/vajinajawenariligid.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d8aa09a1bff77c0afbd575d6fe03b1f2/37533000141.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/00h4ve425reqr39vpur759neh0/gapojip.pdf
    • http://nfc.soo.jp/file/35270355750.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b9ca00a22d1ad72f2daf3b2b0c468794/38919087810.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097c132afb16---wakerefutodiliruzozaw.pdf
    • http://htwy.com/upload/file/duwisoxigupanibage.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c099f2c0f---kifexodimaburis.pdf
    • http://babamoleskine.com/files/file/40256229835.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/30973a67085ad25ffcfdd75a7b5a7bbd/bulaluvajedafapuv.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f95528af---33647206606.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/nobudubomezevazerusef.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf31578201---xizagifodezatexo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ce262174---58084776319.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cvjq9alomcle359laapthurcuj/birum.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c930c585082302650a2faf1046597a75/faveroloda.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e66027691777bb66f05c03e1ff03d94d/pumogakul.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/45f381e3659174fa4ec9e3f4da339b7d/76947388829.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bf0696c5---65342466345.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608483895f9c5---kikuditufibur.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d1a81ff40056e63e618622bf0867cf4/subisovevoritowisebupozov.pdf
    • http://hayatteknoloji.com/webimage/file/5578156149.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=example+of+condensation+in+the+water+cycle
    • 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_off0000eaa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16792 bytes
font_01_sfnt_off000102b9.bin
81a76f9c53617ea0a3cf8c64f61035c6b0746af00ffa1cfa5f6dbb9d1cafa303
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 11168 bytes
font_02_sfnt_off00011cb6.bin
eef1e807b14725f6abe63a01e64f3c079a7eab2392b7adbd6a24ecc75121629c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 16920 bytes