Malicious PDF — malware analysis report

Static analysis result for SHA-256 061d0df1967a07fc…

MALICIOUS

PDF

76.1 KB Created: 2021-07-20 12:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf834ae563991349c6d6a18dd0eab29f SHA-1: fb3141f2919c704295eaf9ba75086f77ef1d6f5f SHA-256: 061d0df1967a07fcc8e4eac0555f9c8e5d58d74bfe59581ad70771db8c91ad39
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting, indicative of a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://szao-spb.ru/images/news/file/76064276917.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1bd71869---36211902539.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087ea18f05---tidepozutamusulamez.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/26942837104.pdfIn PDF document text
    • http://bloomlight.pl/_bloom/file/fivikoxarufidu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106270902.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808625b8f4---dijezu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tutedovotaxegobofoginileg.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/lutesanudupidujewiwatamox.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/zizezinosikalixetusajozo.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/b5620e709f693d5cf4789efbe678d161/serajarukuzesozowatu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a088ba0e---26766619195.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de62e8bce2b---11850107702.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085df68c0ac6---54005744223.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/gowokoromaru.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/48992709151.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b1339343b---96841135020.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7468b7c0---jozet.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9ddc41e0---51764836957.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/80677947144.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/amd02f9nbkp6v4b68cfhk231i5/gekasipituweno.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160706ba44ecd3---radotewokamisiwenirori.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210625105356.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/samopenusozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+furnace+with+a+vertical+air+flowPDF link annotation
    • 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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 16368 bytes
SHA-256: e8b7c97b5f6eefc7442ef9575629ad1d764266db470ca604a2dc5d25b18667d2
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10496 bytes
SHA-256: 3a9080ecbc5e9570d17e34ee4a8f95f52fe03c4940c955761513b8569a01ff80
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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