Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac14e21b9d08f1…

MALICIOUS

PDF

95.3 KB Created: 2021-09-13 11:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6640688e7d2c4684a7ae319c436bcee SHA-1: faa25d3cce098737e10a469bb9c7d9b7b1e27a3e SHA-256: 88ac14e21b9d08f1c961982113bacd3dbaec2d721ac1b566983fbf4a29a46c14
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://sharenkon.com/files/tupemejetar.pdf In PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/bopilatepatotomoposi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/wuwilixejalosobunugon.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70d8db74b---sulupajukabino.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/vebuvojuwejojisugokurofuz.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/bufitipojijitufosere.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/62343492616.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/divomezow.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/69763336562.pdfIn PDF document text
    • http://benetalent.com/upload/files/34593481996.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b53eb12---72704534667.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vafenisumefitos.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/vipeludadabifewevipevabip.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/kavusipagulunaxa.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dunut.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109052248141535.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/26942273514.pdfIn PDF document text
    • https://autoskola-scp.com/files/54941184669.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/majerox.pdfIn PDF document text
    • http://mcutech.net/files/kosukuxu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/gotibabodojev.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/85195505872.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d355b6008a---95545474881.pdfIn PDF document text
    • https://melz-feu.ru/upload/5597282495.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/noxesinutumowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+lady+of+heaven+onlinePDF 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_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 10228 bytes
SHA-256: f387e4f178faf339abe50a3e37837fc70d2ab15ececc8565c69701a8600f34e2
font_01_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B93 20052 bytes
SHA-256: fa3f44ccbcf8ed69eab425aa55e4155e23d2d9502ceb82f13ac1bbdb45f3e58f

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