Malicious PDF — malware analysis report

Static analysis result for SHA-256 597cdb4563052e6b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 00:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bd4be65fdfa9f3e500984bffa491ac7 SHA-1: 6eb8c3c31caf4186e92f2445fefaadb1b2cd2121 SHA-256: 597cdb4563052e6b3a45219104b853a6895a5778e24044710f973c2bfdf7d511
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely serving as a lure for phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ed3d62bc---15519993541.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ql0mo1jiig1c08dhjbhs8nvkvs/32645668798.pdf
    • http://eviljoy.com/UserFiles/File/bogudaxurikem.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/65b45bdd5652994765122304855a2813/rilalowotukafesupubukinil.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/90997408386cb396c52061859f335d32/25759638213.pdf
    • http://patp1ryb.ru/media/file/lebemopolanilavanere.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fae35a369---46353692050.pdf
    • http://nutrisoilvietnam.com/upload/files/4877191751.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3d66dd4c---wobusepanajopu.pdf
    • http://autodilykanka.cz/cmsimple/images/file/1887154946.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d236d0147b---19793893025.pdf
    • http://a-aqua.fr/ressource/site-image/files/pezerudanurizub.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdf
    • https://bevelec.com/bevelec/dossierMois/file/jujanupezudakonokobopip.pdf
    • http://virus-safe-zone.com/ckupload/files/napinijonud.pdf
    • http://katheran.com/clients/55933/File/gejalazulatatusat.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e9306b31---gadozapisufakap.pdf
    • https://arrayamed.com/userfiles/file/majamodemuzowelemaj.pdf
    • http://ingegnasrl.com/userfiles/files/rubutixonurixafedukuzo.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/74537895605.pdf
    • https://reformedgeneration.com/userfiles/file/38667656670.pdf
    • http://dobrasekacka.cz/userfiles/file/6696250988.pdf
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/xalilivu.pdf
    • http://zimmerei-possert.at/46109997955.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=risperidone+davis+drug+guide+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 16792 bytes
font_01_sfnt_off0000dfc1.bin
352d845bf70faea123518fea6c565e0cd4ef0fc44a3de86289da6408607497d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10740 bytes
font_02_sfnt_off0000f854.bin
e1288cb8fcb4c5833b6ada47e0e1f728848e214a3b38ea9aa2578afdd1c7d49b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 18152 bytes