Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc1623ae53dd822…

MALICIOUS

PDF

94.1 KB Created: 2021-06-11 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c7cb7f9e3817ed9d247680b4f56429f SHA-1: 70cc5b23ee8a6b6f9b73152c8ac84f21b899ad63 SHA-256: cdc1623ae53dd82213fed096df31a45138e7c06f5e56f6dfebc99e7b0237f0cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall structure indicate an attempt to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=shrines+zelda+breath+of+the+wild+map PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fadf5c103---75655446654.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/nudosinube.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/64ccce2f14e7591284664154346ebc5f/lenejatuvefoxem.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/femekepel.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553cfedb4e---nebadezojesujutibe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608291c2d63a3---nofewezanakedowa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h93b10nf3lbi1jjdsp6rq3gea1/sotufarujoxok.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/43333619600.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/440ef1ffc135149812cc082610816701/vizegebokewozulomunisawi.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4d27c3b78809930e2862277943841148/fisalev.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87e1687b5---wejixanuwuxoxekifoz.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6ogq1hjo55vd1vpv043o7m0gd/wajifiwajobitelizelu.pdfIn PDF document text
    • http://fructusartis.com/i/File/dotadokovanifobovakunow.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ximemotibovubumapon.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/714588ec625ab265777c0a3333caa36c/64218088032.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7a075ae9---jukowa.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/95306859995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 5668 bytes
SHA-256: c13f34e34aa753ec8a4480742c89c0a615129475b078476f88ec48d477d72158
font_01_sfnt_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 10880 bytes
SHA-256: 2ee0828ccb76420e1d544ec125ea9fd98be03b7b4e845a940940a489b9a284eb