Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee3afe8f8b681e2…

MALICIOUS

PDF

80.9 KB Created: 2021-07-16 11:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4cbb07a08823489c60ad39c734fd2fb6 SHA-1: d1548125861e26a5a8fe5bc6bb3afea21f3005a5 SHA-256: aee3afe8f8b681e26dc98256b2fe46bf382ae39fadc63ccad54ee4a701e86b77
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://danielstrehlau.com/userfiles/file/82311406264.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/67477900136.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/vomidugosedo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/12ae6ee63377a7e5dd5fc6590a00fced/madixesadejoxegogodezigad.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03189e654---84191763206.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5364d0659---438419608.pdfIn PDF document text
    • http://jp-cable.com/d/files/59513929373.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/m6hbh5cgbkve9gbfb58lsqkac3/lezesagedo.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43266882306.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4klvn2k3b7md6fnvfilhb3vtc9/pomivirijaja.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075737d47bb9---12488638244.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956f2387e85---regasukigobow.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/65333755190.pdfIn PDF document text
    • http://stevis.cz/files/file/62235416194.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a53c37d25f5a8376bb27b744139d2492/nejowene.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062011032573.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd1a2d7365---vibivulifogovamok.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988212f38cb---zafiperiwebog.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b0713d9b3---tipazopodon.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/30647894703.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35f2b59eb---wepafobokufapiditi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a50486e55---7276080076.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/62b98c26c8b76cf195a3ae45f51179fb/87190071508.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/15e97ddb3f704429c677ecc1ae04cc7b/wudujesaraxigefivosolafej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nice+adjectives+beginning+with+dPDF 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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10780 bytes
SHA-256: 6c748c1dc783b90151031eb3f335b949ca10f8be15801455f8c4fe4418f54ab4
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 15204 bytes
SHA-256: b1e032c7752230f6fcb2bd9ab0fc36503c960be05398edaf9f1ca094010c7826
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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