Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f9e1d0e5025b25…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 02:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43d4b0973d1465827cb91e3fdf14b292 SHA-1: a3378f8cc4708b2d18be2519587d3c5779054b57 SHA-256: d5f9e1d0e5025b250911c59984025bc7d539fb27c8f44636f5d15a6e4bfdd337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lenaoyunlar.com/calisma2/files/uploads/74401655484.pdf In PDF document text
    • http://defhjdr.friend-match.com/upload/files/8981404048.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/71453819894.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/metujowepavujotumob.pdfIn PDF document text
    • http://clingac.com/d/files/dudiledetono.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492f454be7---19015552415.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gapezadozevox.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gevebikigijalanol.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/jupowetusururumewenowa.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vowomi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5641293b---dabokanagedeza.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/82047171470.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311fc0eac98---razubak.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/23181721644.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wavagasexedegowotigufefo.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/16971151269.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/36915960658.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/53398642618.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/73081740567.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/53841785602.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/4967069363.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/toxigejoguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+preset+lightroom+for+androidPDF 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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 11032 bytes
SHA-256: 259a94f948ff827a6c203196f40894c28f16a163ac09fa632a76c78189bec1f8
font_01_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 18596 bytes
SHA-256: 137e496e2eb027e24b3262fc5c8edbc3039d67b984febb061f5c3f63c75ba520