Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9917afca9f914…

MALICIOUS

PDF

90.2 KB Created: 2021-09-05 18:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 790ccb8a2f4baefbfb7c8b38d9cf43ea SHA-1: 773705facb0a4374b33fd553b3ba5b44d3e82c32 SHA-256: 8bc9917afca9f914f281f780e8279b2f8982518e272af21ee3012b2629362a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=les+formes+de+phrases+pdf PDF link annotation
    • http://motivationandmomentum.net/ci/userfiles/files/483836364.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/rejetumidowuta.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4578f135ae809ff8e366a3f32b175af7/fabopujiwatowinuwaxes.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/40693769351.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f21675bb4f5152e1f85d5f0452922fc8/gexumivajet.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/xexegerajevi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/kisakuwetizapovubupe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdd54b9b---5653404576.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51c1827da---90867310572.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/rikh8orfk7i9prfun50avcubu2/gijazodaw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f398f33c9c7---kepelifidirigasov.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/82632893191.pdfIn PDF document text
    • https://led7.ru/file/79929493000.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5b61bbdc1d4ccaff46fe88286da8b17f/99389364392.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bk37j5q1i27jksa41fu95duv73/waluzene.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/41508975839.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jesidodegiwowig.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0f9219eb---61859246330.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/58f8a39e9e2393a46d7874483cfed2bd/totidelafugakuromejaxa.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/90663179477.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d631608b62---39105993817.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/bamarazowokufi.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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 19832 bytes
SHA-256: ccbbb5c5be33b8a4b8557a51d1a7a705768b2e0e73d753091e3a87ce4c36c414
font_01_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 10380 bytes
SHA-256: 5c728bcd65f6c21975a3fe7147316acc6a49ce3048e32c266bd5744c47e35485

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