Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a990e945f5d5fd…

MALICIOUS

PDF

99.0 KB Created: 2021-08-09 11:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3538306bd32595e3d5c3e8af402cf5e7 SHA-1: 8140e639658cc0cc0a7cd0481ce776448a8ae433 SHA-256: a5a990e945f5d5fdb8e3a8ff05b4aed33bd99eabad65a5144903e5ee32ff1837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pistant.ru/uplcv?utm_term=como+activar+win+7+ultimate+64+bits PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942c4a8ef78---tumabepopilodimoruso.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0176d70e5---korunubeteruduzos.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5dca350087f0dddef0752bd83827c1dd/xebegipojefabixiwofi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73abf2ace6---gosiwit.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bupavibedudunaposovugi.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/fevetamesexome.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/70263943425.pdfIn PDF document text
    • https://superpart.com/files/ruxesomirikudenuk.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c8f67dcb---koxurozofejalotabululu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/jukoguxoniwotu.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/jitovugulop.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2c4ede10---1351966947.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/57771164075.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/jepomozijak.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae21d3cfe9---muritakevamano.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/898aecccc1b446f2dc97e9437130898a/70069975383.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d630c3e---zagudusoxegoguvafaveture.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/73554127917.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/rilogekuvigewitawosojidup.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/44441909983.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/82720835026.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 11108 bytes
SHA-256: 935ca99f7ebacc66099ca777533b3300cd997b0edd65ce0225a52414c282443e
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16664 bytes
SHA-256: d240a98b348ad4f217abdd049d2cdd54cd80e99d20ebba4b08d031d70f49324a
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 19764 bytes
SHA-256: cf45319aa0177add83b22cec2b568c922ddc7e8845fa5ed479995920c7adb2e6
font_03_sfnt_off00015b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B77 1768 bytes
SHA-256: 14d5010429acba28de24e64d681e23aa8c19a4b873130c0598b5369d8dd1949f
font_04_sfnt_off000163c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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