Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89684dc8b277d84…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 20:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1376a06180ad1edf2836d2c55d1349fc SHA-1: 7ea307397eed25cf1938784c7e8df8ae31014d60 SHA-256: e89684dc8b277d84bbd3ba54fe114803e62c16f4ec1ef215828234665d26321f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of external URIs and compromised CMS upload links further supports the malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=quadratic+equation+method+of+completing+the+square PDF link annotation
    • http://biaikatolikus.hu/files/file/81539005029.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/mesutixexeginuxajemukozo.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/laloriv.pdfIn PDF document text
    • http://soc-in.com/data/media/files/35593024317.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/88385081062.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/xosisixerada.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/85574440221.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/biropapafebipasosopa.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/55961837290.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/xeruvejosavi.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/jajorudikusamefepidavun.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hvpm5up8cfr7mo4b9h47n21nsc/xovalapaloxadopevetaxitu.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xegelufi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dl02fga20q2f9nt9a09k8bg67p/94060113257.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70769648775.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/46167556764.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dosawesonowuxibuxap.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/kuputanesodazatutaruxa.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kezuvuwowuzojer.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/gisepevunoxe.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/petilumoniwelunekato.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kosogutupuwoput.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416db25db2c---likujixu.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/92562066906.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 17688 bytes
SHA-256: ad6148fd6805f9e3e93889e7400d8b582dcb3fafabc35eb015ed98057745acde
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 11372 bytes
SHA-256: 595c4c6738301338be108c5825ff17c1fcf65b20b1eef1067f99f052a2712d88

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