Malicious PDF — malware analysis report

Static analysis result for SHA-256 1defb96d5c079469…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 01:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66cd37980498a088cce667e52873ea01 SHA-1: f1f494e2255f0881db868e58410a1648b3676db8 SHA-256: 1defb96d5c079469600a60875690d58f58be6c7bf557ad35bc20480768d22477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=very+quick+lunch+ideas PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abae23ceb8---furowugidixiz.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b05808cf39c3c412e05a0067b9a68971/bajurawibotagarukizewajut.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ho7nlfd6ptm9bukecploe5mgf1/kapigijuwif.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/logupedodofegedatofofupij.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/ledenovowefedopuzifiti.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/rurarofufekivajunopom.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcfd24bb1---lazuwipegefazijiragizu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a573fd9b154---jovajorazewubute.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5c11d4bd---kegegozalo.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/daburukiwo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1f30a2a2e3a26b488f33a3050faf5996/tozawitikowut.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bd286409a569c46809d63ea49f9070b/646552659.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/patafog.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/74d74ef6a22f5f082b67cf423d646609/fexufazuku.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c6b9a2c---3570741851.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/53633223969.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/951e314f68bbbea2c048b4e664fc33a4/78641332127.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afba9376fb0---tuwijatagubumifi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160989910538e7---jexiwuniwabaxinelirogile.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/84810qr75qmv86kb2af2ubg5gq/sagelulomepijufubizi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wurorokujanif.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cd5621b6ca3962dda28944da87e73dde/tutatoguvinakowidapuwubuj.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6c455857---32045768523.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 17744 bytes
SHA-256: 2c890763ab05be7c98f7939217845aa14044fcff6f52d30147f78a749aed0733
font_02_sfnt_off000141ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 10668 bytes
SHA-256: 2cf37c4d20ce18ce753997c93cca6d7cdb40cd4d031291c0b7d049d923c83920

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