Malicious PDF — malware analysis report

Static analysis result for SHA-256 97efb815f8f59045…

MALICIOUS

PDF

119.5 KB Created: 2021-06-28 08:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68a7bdc1240115e26a01906e5966507f SHA-1: 63f2b161b6d8b106cf6b8eecc9f70b77256f38c0 SHA-256: 97efb815f8f590457d66e0b5d620cef8502d7ab54ca5a593c1851d5b63f411fe
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to compromised or malicious websites. The presence of multiple links hosted on various domains, some pointing to compromised WordPress installations, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://medvor.ru/uplcv?utm_term=the+prime+factorization+of+85 PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/7uf8meki563hcml3itn35h4020/10949202363.pdfIn PDF document text
    • https://unitjaya.com/contents//files/85981678578.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/eqng6ruerb0m3loh1tf0dmo38h/67132797688.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/kewezasoworaguz.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/batefujejelesigep.pdfIn PDF document text
    • http://nakatka.com/files/file/54767170285.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4o2dsgc8qaoau4h5o95upk6tnn/zibutarixese.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fogejudokurerop.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/85559488209.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fe688bd6e---28331092026.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160829be9007b9---474950078.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3eb0ed1878581675c9731034d1c1f8/61718380473.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ha8ref49mhb31fv996imlv61n4/47095550830.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/napik.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a1561bd3---kafigemokiduvebiraf.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094abc26310c---regoregorebitaveluw.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/29bcfb4da3adb2c4f201f625dfc1c5b9/87365109341.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/97452325260.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/17411736299.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/24e34d4defcdcac1838f4649c6e79e20/30052320334.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/iaat1qq4qo47bd5vpt2otjv835/24547936490.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/66088f6e17f1b62566d7c958f8ee92df/84008550232.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7a667aa4b---kidikovidigununiseveforul.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bekukudafopepos.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/83574108048.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12689acce7345d3dee8e1525b08d570b/zejazewarir.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_off00016851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18068 10896 bytes
SHA-256: bacd41b22fe047bba26519848a1fc886afbf99ce86090d23c18aeec4653a5c5d
font_02_sfnt_off00019988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19988 21900 bytes
SHA-256: 7ac415bd4a4667ea1e7921664526225e635ccd5154e96a35e50d629b11345650

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