Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cc5ae49cf01d7d…

MALICIOUS

PDF

170.0 KB Created: 2021-06-25 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14149890086b746d23bdd8662b18c27a SHA-1: 68da42e18a779bd4436455a181d498970be171f5 SHA-256: 59cc5ae49cf01d7d735420fb60059b3b26d7c43010d53268abe0522a2f092faf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or phishing. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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 http://haiphongcontest.com/images/files/deroxilogedogidukidim.pdf In PDF document text
    • http://billsky.ee/files/file/zofuzemefatekekumobip.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jikiritotoguxomukixejapo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a2d3f89---kumew.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a8025b65ece198de04f629bd04499225/37057446130.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086714a3b5e5---23954808940.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010c9372b6---roxiveku.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/65048921402.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e14baa12---16407487767.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zanuvov.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7bi0h8o63575qie5kok20fj062/79211578098.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54f56ecc---40943633620.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835b6bc214f---42728719174.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a4142e76---zudamata.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rq4e5a7gv88e5qcu8tpp8b54o6/56816695380.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/u1pdi2jl8lpml1ve3vkb3m43je/palerokav.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1c7a0796---88844141557.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789f78a0d06---rurobizipewuwase.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/gofenizolixizogunime.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/52439916600.pdfIn PDF document text
    • https://mmszke.hu/files/file/mekogatorenupupagupefamab.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kigosubeleterad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=javascript+test+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D8D 18540 bytes
SHA-256: 5025b6cb16b989a6cd76e2fa3ac25ec30ec3c5cda1a195e8dc6bff95d58a90bb
font_01_sfnt_off00024e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E7A 10852 bytes
SHA-256: 16ed17ea8be4d7bbf67c2863e4126f07e0e428fc52fafe827a9babed8fdb43f1
font_02_sfnt_off0002677f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2677F 17896 bytes
SHA-256: 0ca025a44cd33dd4d33eac7856598fe54fe4e1fa4072ba1c6e7daf3b68598bf4
font_03_sfnt_off000281a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x281A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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