Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61369c7df1cdf9c…

MALICIOUS

PDF

147.2 KB Created: 2021-06-30 09:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5e9f1fc7c62b913ad5450cedbbbd51dd SHA-1: 819207f1d59490767058eb741a40c006f158c8e3 SHA-256: a61369c7df1cdf9c6519a34a01eb90f854bbed51ea5fb03f1dfe15629a5d53c9
156 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form builder plugins for file uploads. These URLs form a link farm, a common technique for SEO poisoning or distributing malicious content. The presence of multiple compromised hosts and the nature of the URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba87deaee---95189277336.pdf In PDF document text
    • http://15889163.com/ckupload/files/nufaw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd07cb5148---tikidinivogafe.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b690d906d3f---zezudukanirupulilivofe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ae5125201ad4751e1ec10478c66caa16/73388991749.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zoteziselubi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b46ce3a6e---fubivub.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4088ae21b432a5413d9ceefd544ab3da/pekogezusutapamuxed.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d473f287---goxenup.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ph766cpcakrudcqoqsqc4ugvi5/rusaxarasawadulek.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/975d43201bc534d00a24bc0e5b03604c/wujaligomefokijipaj.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vadomokowijoniropufa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee74942696---kupemegite.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4db3cd664007892f77b9000b46441f44/rusim.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ebd25102b5a7d18978deb2d2780701a6/28596088928.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3e02a3e3---texebebabagunetigilunoxo.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210619175238.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12e266a2e---majeduzopuvi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23bcdfedf---mosowumeniwuga.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e9e90320d6793d3124ea4a07ea9806d7/ladifixetakuxik.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2liq5cin8nq18voscasckhhf74/nomezoza.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/ganiwukopuk.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33c958325---vafexefokixumalapil.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ea65cbb4---bexuga.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c10ed812035---46175773127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=perform+the+commands+to+center+the+selected+worksheets+both+horizontally+and+vertically+on+the+printed+pagePDF 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_off0001d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D88A 11624 bytes
SHA-256: 51958edb979739dd6703d5473c895f440785bbef0fa568efae88e63774963c77
font_01_sfnt_off0001f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3B2 17880 bytes
SHA-256: f049cc2b6d8a257f5634621dd61681d55cd85b28cb8a1b026b80881375440d65
font_02_sfnt_off000222cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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