Malicious PDF — malware analysis report

Static analysis result for SHA-256 307f3b62be9ef19d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 01:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a66a71670c31481d10cd66635ac8263 SHA-1: 93a550d0800b76efe0dd5165a47cc23c3aa1cba1 SHA-256: 307f3b62be9ef19d77d1cf9800949b76c61188ea33e4a449b029e80226d39fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using link farms for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=download+kalenjin+bible+pdf PDF link annotation
    • http://gibeaufamily.com/clients/870383/File/66739161328.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/kudinuvukiruwimizuwa.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/buwevutuxabufagof.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f63ca85ce---fodojowapa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ejokoo4kqtcdgdtgrlefv9akpr/jogiruv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c245fceea72---70205392775.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/93536198264.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tonukutejufegot.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/61379350973.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/jamuxojivari.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c90204488---33623483200.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d77c55c4fc9f9cf212123bc566ab21b3/sakajisazize.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8522f2e6d6---dipizurowubovogifunedeg.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/39411120778.pdfIn PDF document text
    • http://actinq.nl/upload/file/winudoxola.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779394b5898---vokozin.pdfIn PDF document text
    • https://sanidom.pl/img/file/23129292638.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/068550ec296405a0cd1d8b6f4ecc33c8/93399156004.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/76721420325.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071003233343.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/tazekuseradugezu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0darfm5ei1009thc7m023lafu3/rosugakisetepup.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xafegetemirajufukivokuwi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jqctn7njfkd8kn57d1n10ua1a2/lebavinuvorulevotiwiredi.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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 17216 bytes
SHA-256: f221d3f64a5d45b80a9ae904582a7674d20c8d54d1424583ed83de5366a61214
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 10576 bytes
SHA-256: 5bd6742a23a5fbb6dcf3a9320c89918daa503c7e589c4d898a020ada879bbdc5
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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