Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a1e7df3643864c…

MALICIOUS

PDF

98.6 KB Created: 2021-07-08 03:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a3eadf5f94ad9449e6c317053e0dc00 SHA-1: b55a8cfd352d2d72b611d0ed15bb5f54616dde74 SHA-256: d3a1e7df3643864cdcaf9ccdf1971a84bfa60f58180184869ec8c84d984c6de1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is designed to lead users to malicious content or phishing pages. The document body is unreadable, but the presence of a link farm and the overall detection profile strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://oniceh.ru/uplcv?utm_term=not+eating+meat PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090eea392a2b---98216745594.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fivukari.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/efh5o96gdeh9oa43kvjdbuv9ld/dozokapufusarufinoza.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/922727fbb49db4680ba81ef0a02e39f5/40722744084.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69e464df0---biwotumu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ip6sl70nivoa1ga2v8b53r7739/95129094082.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/37077158007.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/76006fd3c274acae6ff0bb54cfd6bc53/45430574150.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/95358028068.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/gisusakemowaj.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/500206fc6bd139c4c2c4d34d157d0e2b/92845417321.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/30utb2fglssmotrjigd6c96jm4/gebakepawilur.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160943aa322cd3---lomewifo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b72e100e0---xunuba.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8fb3ac65---porige.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5017t29rjf3fv7np812rp38v5v/34207524662.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/davoxefugilolofelisagojof.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sukanolutaxogoluvoxusij.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf23e671c---81588610723.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/avpg5ighdgnbende6l4v2n78cr/27342142993.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/38996760280.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/694b0b773aede9b7d7f57657fde556e7/26088447478.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/19244771416.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_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 10112 bytes
SHA-256: 927f67f64b11044b808a7322d3764fecfa3b53e20fc8a91dd732e251dc24567e
font_02_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 17104 bytes
SHA-256: cf23fc93b8123ab41180c7fda2fce0bd33c656400c4b4bce3f73a20b724c5de2

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