Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb7a0012481129…

MALICIOUS

PDF

96.5 KB Created: 2021-10-26 07:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce60f61322eefa22df2d4c100b2f9fe1 SHA-1: 9ee503681a3181855d2f9d55b6feab4125f44407 SHA-256: 9cbb7a00124811297d1279975ce04cc901e72be3b63962b6a1e4dbfd82e86354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment used to lure victims to malicious content.

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 http://imhkayseri.com/resimler/files/diwufozojejeladasigogo.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qm0jh09kodn9mabnv5rtrfk521/gukisezabopu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/62326998827.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/wezaxunitobubibexujuj.pdfIn PDF document text
    • https://coevent.ru/upload/files/kixelixaxiramore.pdfIn PDF document text
    • http://rapet.hu/files/kokuwarazup.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/41635382022.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/makuxadavomamukeluzilami.pdfIn PDF document text
    • http://123dvere.sk/files/file/gegokovomiku.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148b358e74f0---xonirumoxogupofene.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/85779913040.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gixewejasefefib.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/junuwus.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/51104705839.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161531015e7c1f---57035802252.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/20063611937.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/bofutupe.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/14979608103.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/12194275720.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1633567076_1.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/32660087802.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/xusil.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/70131817020.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/26586227697.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/57958460030.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=the+crossover+full+pdf+freePDF 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_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 19372 bytes
SHA-256: 43480cbc620822423dfd13bbd003ee29a5b1c28b3c81baf76185f5d14f3f2bea
font_01_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C89 10388 bytes
SHA-256: 320b8f1ac9fd8e6a9e8fe72064727c0a91df3b0b5ea0e9b6f8d82156de03b245