Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb492d9ba83f3278…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 631f9230ed5864b2e1e857a0a6b5befb SHA-1: d7dd875bf7ac0ad353e876c82939348a7bed0c1d SHA-256: fb492d9ba83f32782f4ecbfb7946183c5704c4a6c970c78b47951aa715f262a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious intent.

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://archism.ru/uplcv?utm_term=ceh+official+certified+ethical+hacker+review+guide+pdf PDF link annotation
    • http://pm-ural.com/uploads/files/zejap.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2284671cdb90458e154a8ba98f69c55f/wiponuredapoxokokokefel.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/da8679cee6f182a5ddde4fbb231b2d5b/1752247900.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0fkcpf75oiabho2k3lucucgo56/75535086799.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02b4b09b5a2f60e883896a84aa388b9d/71314166047.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16286209306419.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/116ef89d8adc7228491cbe466bfabb8a/41850492253.pdfIn PDF document text
    • http://cosyromania.com/media/file/romozubajivexavimefotu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/susezazedolalijuza.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qrse4q1nmr96nd93vi4rali0qn/63507516447.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/87183549593.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210713_CD1BD331A1AFF48A.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/95501476433.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c9fc6f3185cc358aac5422a7340611a4/53347877235.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/tudulowi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d32986973ba---xowegagilulazuge.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cbcc67ad---88951894970.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/15123229047.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f74e32a7979975fafd8dabb7052381cf/zolixaziwazitorebujamafe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d7c4dcb---romotiruvunamavobuj.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305b1a9d82---66062478955.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/75709217561.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f292d298---8462613664.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_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 11004 bytes
SHA-256: 2b64bc05b83578d239f9aaf4fa2f9562f3e7f27d17bbb87884e3c99f61cc1e25
font_02_sfnt_off00012bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 19224 bytes
SHA-256: 5ec5b9fb49f64bb9d7c01bad12bf8f09e74560e438fa8b524d76a5ba7c731b31

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