Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde5436256dd60d7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 15:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d33991577f3ef30bc662da88b41ddd6 SHA-1: f7bd63e62bd9fa6c3ed0a106b41126577d30cd05 SHA-256: cde5436256dd60d753e32f59a0963c34f1874896a592d97fbe1d4d9f558c64f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings strongly suggest a phishing or malware distribution campaign.

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 http://farmaciacogliate.it/userfiles/files/94250319857.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/60bc1ece9587c154b08d69640ca108f6/4156732570.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/dulelopavifekapasago.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58d2fb2929831c3a7218a3eae0c66816/229854037.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/96971027790.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/panizelaxoloxiludu.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/tizowodifenezeka.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d026e05f---sifodotiwabeviba.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9f7c3554ce552f22473166cc23d7c800/13364187029.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a5f44f7ceabe6864e356efc1bd73d2/54469244688.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/3954209190.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/226700a8edc45b7b6e087184f28a881a/ludifoli.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u13r912gt06noe30299k0ji8n2/17382326721.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pufojetu.pdfIn PDF document text
    • http://kechengchem.com/upload/files/xamitur.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4700c0fee---xotezagajawawitotaposuw.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/bedifusezamelujalevagaxi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e64b6b21438---42528492592.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/rapexemejusuzikop.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6735b870e---37125209428.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b85643d0f---jotatijixixalezexopurev.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/can05g86ejn45gfi2tussd0vs3/41666488862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=multicooker+delimano+18+in+1+manualPDF 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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10808 bytes
SHA-256: 01c663dbfd0f945a61f33353623b777dec238e4120bcf0df40763a5ac125e5cf
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 19500 bytes
SHA-256: afcd364d16f3fbc22104eef376b79291c1f8748edace22d0a53b37900cc16f5b

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