Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f5fff2268d4a8a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 08:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ef2f3f5d5b35f944b3e0a0c83378f66 SHA-1: ae4931b135a1fb34dded6f7c58af6ee42467a24a SHA-256: e2f5fff2268d4a8ac68cfeedd99c83885e1a3703b0be9ff229de16ad817a5f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the nature of the URLs and the detection suggest it likely exploits PDF vulnerabilities or redirects to malicious JavaScript, aligning with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f79f94ae31c---mapokuzenutuxebu.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/65212929648.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a918e242---mategubeb.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610f25bc31da1---gozusisoraso.pdf
    • http://technology-mp.it/userfiles/files/19695248985.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/galenojijolemepuk.pdf
    • https://salonrewards.ca/images/file/fibejulat.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d511ca4020ddd56f49531c77c504669c/legoduziwatasij.pdf
    • https://facades-et-traditions.com/actualites/file/jukowiwafagu.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fe1d914e---tejijavawevanuzijerajo.pdf
    • http://caratow.eu/userfiles/file/92399766064.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9dff11703d2312d8c014fbc7d1e09207/toroselivanud.pdf
    • http://odpadykj.cz/UserFiles/File/27937347719.pdf
    • http://pileshoppen.dk/userfiles/file/wujomuze.pdf
    • http://iwishop.hu/file/tavowotiboxoteku.pdf
    • http://ecoevopublisher.com/files/upfiles/file/35183177836.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e10191547---watafuxadavaja.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c43f7e33a52---95102140820.pdf
    • http://petra-dario.info/upload/datoteke/lewixamedexoj.pdf
    • http://arcenevents.nl/site/upload/files/47091926766.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/sigovepozemujupo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4e4df723---fizodofuxifokewik.pdf
    • http://vigova.vn/Images_upload/files/pupagenaka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=restriking+voltage+and+recovery+voltage+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4b.bin
7bd41c378087fe96e8f124ef3085147c4a30359eb2b7e32f14ca8f93a07982dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 17684 bytes
font_01_sfnt_off0001080a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
font_02_sfnt_off00012021.bin
5c3695ee1af00407c5aa0fbab83f8353db0e06997affc0cdee17b44c3cb255a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 11112 bytes