Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af5fcf735d3f014…

MALICIOUS

PDF

97.7 KB Created: 2021-06-28 18:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b9d274bf8a859ac90f7e1c6e931e0026 SHA-1: 69054fdae043ac4dcca500f4201cf8d7401c0e3c SHA-256: 2af5fcf735d3f014569b0e158d193558102906f5953102dead4a0e2e4bcbc7fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://krisoc.ru/uplcv?utm_term=how+do+you+save+a+powerpoint+as+a+pdf PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1f971b109f0f65f25432e3c108d15a21/sidej.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26b0b09b---madiva.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a748d119---8605992829.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/62c34bb6caeb88b81267689ee59b823f/dusatajamopulevad.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/55ca337caeffe3ab62459c6f92d42cec/61305177616.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hrgrhh0mkq6ck7rpsv8okikqsb/wuxupofotokakiwukotuzena.pdfIn PDF document text
    • http://sam-global.info/files/file/xuxexatokat.pdfIn PDF document text
    • http://learningkey.org/userfiles/tisulelizajifutozo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/680e6c70b673791624f73172a12c1172/leluzesi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4235b4dcb2---57421549037.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/dd968db79c3c7a073e34a2a7c8783c58/39637320265.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9efg7mtlm13h7l7odj7v20u7ak/dawekusudesegewitakiwa.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ln7ad7pnbg5nt45dup24aofffr/tozadujimudut.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/67181000332.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/dadakunivus.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74944df53c---datenekef.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e13ceb5391bd1da6d682c0d12b61d8f8/gobasegew.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a08a7bf4---40103843271.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b6c87c3020abd89a27832f40c210130a/94535987988.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/88656566693.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/ruxafedoweruxunul.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210628055059.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bireg.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab9098222---jetonutuwatamivin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 19080 bytes
SHA-256: a0616a79b568e7f5af61dee4a75ed48a694735e0b3649cb9602cf0724fb6a59e
font_01_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 17032 bytes
SHA-256: 3e03a5500429ac6306e56a03ff5b87db7cffb6b0348c7d22d6eb8a41daaf3ad0
font_02_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 10804 bytes
SHA-256: 2e6f81ba00a52017242da34c67c73aac5fd06fced202a3c35725748eb096c0b4
font_03_sfnt_off00015ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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