Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76587335cf7968e…

MALICIOUS

PDF

94.2 KB Created: 2021-07-06 16:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 241c8c3e7fcd54d2a10817b5729e890f SHA-1: 817f82f474adc7b8a39ec50f1cb288e4c542d79f SHA-256: d76587335cf7968ed9fe1ff47394fdcd519df2ae7e58bba1a8a20784c20f0d09
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://electrabicycles.pl/app/webroot/uploads/file/16205888840172.pdf In PDF document text
    • http://uamarkets.com/images/file/gebuluwodefubomewu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/08e60745148eb1720c415d223db5c177/zebijiwuwidamoz.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b0611b4f64517ce1ca265468e8d68d73/galidexo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a198994410---vadosusejufixuwibujise.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/15c41d07e50f6ad6d532ddd7d544bb80/3371800852.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/tobise.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/73448664234.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9f7bd9b3---leremaxiwozutu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/36d60c0bd4833f2fe7e3b9f037d59796/fitib.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/jiloxubizarobeko.pdfIn PDF document text
    • https://norservis.info/files/files/57848939541.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/guwidi.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/sirugopakaw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ad94a6f07d802e634c7af74d9bf477de/57500499232.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070821655f5e---xolavanatebitibik.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/17828172267.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/77783183541.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/529d91b846634d121e093ddd69270aea/63648203625.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/45p75ftghaafjhbav754ahi1l7/ledufod.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e34dc5d69be---xijesivufulemogoravabojew.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b744b173aea0e19c9fded7bdae3ca767/vezolevowetumakogelutima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=book+of+potions+harry+potter+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 17556 bytes
SHA-256: 8f709737ed3e09bd535d1bdb1994830c1dfb85bc520f1738cb4b49f18d4de08d
font_02_sfnt_off0001529b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529B 10808 bytes
SHA-256: 0bf829e29f5ab25387b37a3970e5d8bc3b5d9ad79b2e1aea7b87bd5b268968a4

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