Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f14dfae5b0ea40…

MALICIOUS

PDF

70.7 KB Created: 2021-06-30 00:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e9003109f1cd8cbce4590851fcfc22a SHA-1: a53058a038423c1c2c3164c27d7871e504cda254 SHA-256: 77f14dfae5b0ea406e2844a6db0fdcac17788805ae30c58c88b881154d78676c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts. Although no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01392975a---vozuwuxatazopimudim.pdf In PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d36d12d5c903640dd092e21cf41a5e7a/32942692964.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2khge3366tnksrjkoifn4qdd9c/95522616743.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/88979089618.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/dijaduroxibuj.pdfIn PDF document text
    • http://renovator.cz/files/file/kuxudefodasuvoz.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/visalodukigozaxupekejo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ueasoob4te3d1mc4uvan49ao1j/tajimipujuxomuxadi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851599b7130---84867380293.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df3a18930---68475351237.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mokadorajesozi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/punuxak.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/88866758587.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b02e2c2f9e9ebebadeccc3a1967bc5dc/29018284144.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/88553257588.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d595eb6d2---60786742203.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r1fmuck69mtgt1kltfpceql3tk/kogigoxaxatipisogawirok.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ci22586d45i90rn9bac5vbokv7/47249988273.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5fbf3f55---pawuwaneroje.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba016dc35dd---99662198559.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/namamo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e173015c---34742626294.pdfIn PDF document text
    • https://immobilgold.com/file/lival.pdfIn PDF document text
    • https://khanikango.in/file/figazefivij.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a25adc2e---62717837121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=30+ounces+in+kgPDF 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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 10388 bytes
SHA-256: d1f3f8758dc4837a3fb8b962a8d0a3a201c6ef486da27cf923e510076dd1ecb9
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 14560 bytes
SHA-256: 110503f56c8c52916fcdfa1d7f0b56c440735b42d8a55c46c9825caccb7e6c3e
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1