Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a4514a76266ef…

MALICIOUS

PDF

101.1 KB Created: 2021-07-07 15:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3313bf593e6577d847fe93cf639d4fd5 SHA-1: 707d790b512243dbf4c4fda7be6198b024a5fe7f SHA-256: 5b4a4514a76266ef634b51cd2370bfbd9cd1b643ccb03460843871c40eb336e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607328456523e---naxiko.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/83a14110dad994c0bc8acbd01c9f2692/46738829410.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/12010626778.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/33280190884.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/s3e3o352fu92phfhoothg96ci5/2649132787.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pejoxitodujox.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2429af719a372d5392611173de9e1fc5/fuzaropanu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d817690adaf---14127761506.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8uq0dpjorid2f3feom2ubbqgen/xunaxok.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3224c3d6---rusudafuzoranonedujimovep.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/36102239447.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zujekotevodet.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609153c3d67f9---29103461116.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdf030dd0---43863291763.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f65b952639ce54eeeae8f25208e2b6be/14273844419.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/kiduf.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/97867900537.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tugepepupajizufaf.pdfIn PDF document text
    • https://bem-sa.com/img/file/fadav.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/38c088348a0a3944cec8b4fb57c54acd/63906390318.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3f12d4b8---rovuzitajililozetowip.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/02b053f0b15d30d1994fb574d49d2469/23111649380.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/750bbf4080e477c73758a2b158323865/18118128954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+vindication+of+absolute+idealismPDF 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_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 10908 bytes
SHA-256: 75fccc5ce122cec857ce672336e0983ad1f0b1072a31ccd895d7c30992d57030
font_01_sfnt_off00013f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F67 18696 bytes
SHA-256: f80cabda439c7cf3cb44d83a873b8b6c40b880d3af79439b560904ac2086f62e
font_02_sfnt_off00016eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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