Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f11a6feab58f0e…

MALICIOUS

PDF

96.2 KB Created: 2021-07-16 20:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6764fb44b4a1d9386c217ba32e2585c SHA-1: 26b8ac7a7d0d8e3974abf807bdc2874b349e1067 SHA-256: 29f11a6feab58f0ef4a442523cb0172744b4bac5c5f356ecbf4aa8ead6619ecc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/og3jq2umjmi4fskq59v9j89vc4/7937259170.pdf In PDF document text
    • https://bdsvieclam.com/upload/files/puvabaragiside.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qn4219v85rjmdq1bvt93363to7/vufirukopurego.pdfIn PDF document text
    • http://short-story.ru/upload/file/xodoruvijo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bleuu2olp28atv4hueaa95macq/mekofuse.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/20315253962.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xazagifolopezi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c397a17e---19909317111.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/e5sdobv26gddtcdo117nrit6pn/12399957044.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/61705be71a301e0dc39fe9d61330150b/22956723671.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ece66c7240a---82953389610.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/silezerawitojik.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/135c124c19020ac6ce3e95e99d55b771/6677235662.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caf193b7128---55901640055.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210715_13AAC3AF5D76924C.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758fef45feb---68098053943.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4fdb1e6b5818f21b6d3354f250a7cb5/tugesifesanevuzubuzepit.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fp41b4plnbpg6i8ff2gpdc8h0d/misediwezopipekokinaxu.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/78528887357.pdfIn PDF document text
    • http://hasyo.net/files/file/45655794164.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/beraxuzeperoxoxezu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9c808a21---lirajaxaramuf.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/bagapuwavikibaluduniwuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+cool+capes+in+minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012626.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12626 17812 bytes
SHA-256: fed4bb7f4b8f67fde84409bb43d0b26c9dafb05475b3601572d145a938b0d962
font_00_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 16856 bytes
SHA-256: f83599da4f928964af2ddb111c8377ba2969271381af04fa98bfd37381978f07
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000159ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BA 10900 bytes
SHA-256: c0d659b29e4b122768b6bc83d2e17a34deacb70050c0df6384457cb6d7b516ed

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