Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d8f489a1818c8a…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6428c708b7db0ba6a8cb283b9080750f SHA-1: 9ee3327a1779d1b694fa94f76fec0e40fdb7a264 SHA-256: 88d8f489a1818c8a3bfc24993f29f25480dc159546d9bfcae0a9ab3f32268b88
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. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=one+piece+the+movie+watch+free PDF link annotation
    • https://nieruchomosciprzetargi.pl/files/file/sidupegixoninelijudolido.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/pukuligodaji.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52935756280.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7f4ec22d---sitijedogivewupemuxijufi.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/wofuvegurikijo.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/63746071117.pdfIn PDF document text
    • http://portableandcool.com/files/files/70245246831.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/31881020257.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vupelejabizoxusaduviruzop.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/19307696392.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131540fb5f94---60096934234.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/bebul.pdfIn PDF document text
    • https://mimpishio.com/contents/files/61527656114.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9e6cb1ef4cde108e62a11cb9aff1a3a4/zaxubonife.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/numimakefosiratomewi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/54143686342.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/gamopoditejegenox.pdfIn PDF document text
    • http://kodemari.info/data/files/97602314084.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/karuviduxizinumopalisovij.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/57128430079.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/xinapuseminejiramugaxiza.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/52240481075.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mipanuza.pdfIn 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://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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 17964 bytes
SHA-256: 6969a23def779730a30921935eced090e1e15ca90662c2c32d5b2ed28e6661cf
font_01_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 10708 bytes
SHA-256: a30e294fca7eb69eaebcaa2fce0d1e31fdb2ccf5fac9707a5a8e84ca8e475c05
font_02_sfnt_off00013f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.