Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e65e40ef2db957c…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a64f26ff2f5a28f1245bf92ef582986a SHA-1: 9d69ca01ce192f43eb4878701793220184fa057a SHA-256: 8e65e40ef2db957cfc2128832da2296d38d2ab5c84590c8a60d147a0e1140d10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure and URL distribution suggest it functions as a link farm, likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://cambodiadriverservice.com/userfiles/file/nugizadexa.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/78e89f5369e9525087e5e97df504a8bc/lofavujotevuvavuxizu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce52a4298---17059971265.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/86fa1226e40612729794946c98b81462/55546830736.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327536df3b---pidiro.pdf
    • http://cnex.cc/images/blog//file/16104348214.pdf
    • http://shopcloud.cloud//ckfinder/userfiles/files/keropiw.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1a6278c8---61648774060.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701082b412c---22426928834.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/7fc3dd3e5132c82d7c94b302024ef77c/4116484493.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c585e9aa566---bopovexavedepalanujeba.pdf
    • https://ubranni.com/uploader/files/gazix.pdf
    • http://pspectr.ru/userfiles/file/selezit.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b9cc66dfad9e660c7847bc4dcfd9718e/93506171220.pdf
    • http://seibyou-koujien.com/files/files/96809025812.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6cd35c8c7ed61c785d5d2906b3d4f1db/19201468766.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/16c8d0e806e0108ef40e604829067522/nudilireretulogesabamaj.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5a9d742910ae457b0c540f0544872d27/zozoribojusiwozidam.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rdevltk04r690av6g91uvlae49/44355434895.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40a66d612---wiwajebijazi.pdf
    • http://instandee.com/Images_upload/files/44410064465.pdf
    • https://contactfm.be/userfiles/files/bupaxadupizo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f020a7f09b---44626429259.pdf
    • https://jackyrouxmethode.com/userfiles/file/xoroneti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ductal+carcinoma+grade+3
    • 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_off00010408.bin
ac9b3ef866f21500d7ba75f8ba6763d5e7d71701ba631d77a5ea6cff94083f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10816 bytes
font_01_sfnt_off00011cc2.bin
9d1badb8e4e0977b925d8dba3ba9c74e615347638451a14b3c4468b542948c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16304 bytes
font_02_sfnt_off00014706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 16792 bytes