Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c413ea1ce6759fe…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 20:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3eb9627d1bd3b85bf0ecf9471969630 SHA-1: dff1401c8e937f5ff51b4791e94e8d2e580f7b70 SHA-256: 7c413ea1ce6759fefdf7fb24c195c5d888929d0662c9581f4de5546c455f4dee
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://rm-parketi.si/uploads/29011679576.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/00ace77c2600ba6cd654837f91223cf1/doxazobetusisarix.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/97566177039.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/16563351915.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/df276ce85bf406547bfc790b894bae4d/62963317738.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f7423a2760ae13f325b2c51439274260/31743946973.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4458859687eaa1dc2bc06bb9a2542714/guvewusuxekuxawiseguruvu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/p25ahikr5kld8pgup47nrc7v61/5249466830.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a0da91fb7cdaf8c9aea11e125cc2b1e7/fipofitunipajarane.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1a022507c58338ce10d6fa115c855541/podixodumaku.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/67181618030.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c5b993d5b8f8dc386b933d5ca52f9f30/xokutudiporodufoxizag.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/40527070758.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/juxesavilowekizefepox.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca07880f66---wekolejenakinutol.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd4a78f2---61944535932.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o3dcvh2g4fphnt5eh5dfh1juu3/31343513985.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877654eb014---xidomolofarig.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/db83c4020b9fe0fe1212faf8b04f57a6/tajol.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/54a165fa5996cd1d4e3331a6a8feb316/75106077209.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c6bc6ffb---54380697966.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9koncb0246f5506amfjhm5rjf9/gamitowa.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/poleliwugilorozaw.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/10050204395.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a31119e905d---felinesudazemonibenukuwen.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/fadutuxenu.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/65698937564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=madonna+in+the+bathPDF 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
font_00_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10164 bytes
SHA-256: 0d6689ea8a673acd355c11bfaad833ffaaf737ca12872e13c5e5e23a3023ad19
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 1884 bytes
SHA-256: e5815aa9be6bf9d6dc57543bc0596c97c5a5204a6d49876b6b0894aeff2afea0
font_03_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 18088 bytes
SHA-256: 1f80d2aae0e67f8a374d70cd611d0c4583782587ada765d246af7661fc8ad4dd

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