Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8fd3356cba5ae8…

MALICIOUS

PDF

125.9 KB Created: 2021-08-04 19:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26cad5db57967d8b8b132c1d50dae296 SHA-1: 92242e3b73d9e21022e1960830260330558e0fb4 SHA-256: aa8fd3356cba5ae80ab71e30928e19aaa7c33bd32d26d12613ff69ce29242594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://allytemp.ru/uplcv?utm_term=euro+truck+simulator+2+best+mods+2020 PDF link annotation
    • https://menu2uplus.com/images/file/jesinimabad.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528010913.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jmgo6j92u3ka1jhirilf1nbdl0/21318584180.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/40582985426.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210603045721.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/subuzu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2f600b32fdf921cca4772156aa27f348/lodokabesujiwe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/28214775638.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/458fhnhrhheduqs92k9271vkb6/visokitorerebugakepagu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kevilinodijagojurufez.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rutedefifemaposenitox.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908478a8d2---lanowefezegipeb.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/47681295088.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/42105079187.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3015d3d577---gujigok.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/zomuze.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/62214171288.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e901aa2fb---54919783506.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/gefesodexiguzotufake.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/womotetunaxiridopugurudi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mcpqdnhrnci95s5rmd1eu4p491/77277702778.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8bcfe0f531b98d80a8ed27a7e17779e5/gewupufapapubonetoxeruda.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/fd8b78dc1a26f7331213949e65bbf6c6/jutodiresogafilobux.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/31168481806.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/32964969722.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DE 18880 bytes
SHA-256: 739b4532e61a0156b3cc2b71ef8ecf891426414c2f90fe66ef6d02f100884a90
font_01_sfnt_off0001b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF1F 10984 bytes
SHA-256: a9a93d64aed14408293762f60a3ff62120ed8acfce8a204e4c57cc238537f582

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