Malicious PDF — malware analysis report

Static analysis result for SHA-256 1675c92437179645…

MALICIOUS

PDF

78.9 KB Created: 2021-07-22 09:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de156c17567aed1a8fa89efed8be6a8d SHA-1: b9974092f9fbb1f6cb4f58eb0bc708c193361f4f SHA-256: 1675c924371796458956a8bc6968ca975c2de19ca3cf00bb8ac9f5b3b7e09ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing lures. The document body is unreadable, but the presence of numerous external links and the detection signatures strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972d4c70d1e---65716040180.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7bmuvoitd32n3o5lmip2ir4d5j/motowofune.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806e3ad54ef---37158065623.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/veluxazijab.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c5cf2ad82---mufom.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5d3ea57f---favetiximatonanarubakota.pdf
    • http://skomi.ru/img/files/file/purigadifisibenom.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/gogisefavoronivetakoguw.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/hrh582ef3q0sqnujerjtpjg471/xuwenawitagepelibud.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vizirokugexurareviwuzis.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/29244754709.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c24348d2c0---bodafexeturobaji.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160883c6ade454---1313049513.pdf
    • http://bostonmentors.com/userfiles/file/jokukumidurimabi.pdf
    • https://matrainagycsalados.hu/userfiles/file/xewobugugafogilipiko.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071149b70de1---mogoro.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b111e14d835---79476870512.pdf
    • http://lg-palette.com/upload/files/revujerapadojifitidowez.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bae06299c1b---julapizalexola.pdf
    • http://primethailand.com/ckfinder/userfiles/files/14714336720.pdf
    • http://kingbikeonline.com/images/upload/File/27991228520.pdf
    • http://nickels.design/ckfinder/userfiles/files/kedinazibugibenunovivuv.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff9c1d5cd---56421019294.pdf
    • https://edusfera.pl/upload/file/koxilojowaxi.pdf
    • https://sayurmateng.com/contents//files/poretokepol.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4723eeed9---24793493704.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=css+enlarge+image
    • 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_off0000d21f.bin
19d25e1e99ce5b6c64df5cd9c2aa3114619d0bbc00812061a9ba5f6f2542904e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 10264 bytes
font_01_sfnt_off0000e928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 16792 bytes
font_02_sfnt_off0001013a.bin
59770dfb988f464e04a8b8d5eaaf29b15814e7f6156ee34be77e6d9d52b459da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16968 bytes