Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4522b82efeba389…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 20:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa96ec6406275aeecb6ad7896a07394b SHA-1: db8e59ed68cd35d5bcf2c62db9f423e266765328 SHA-256: d4522b82efeba38973f7288388f4151c7ca839f246cf56766cee01168a60d4e1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to host and distribute further malicious content. The presence of embedded URLs indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://gagutp.com/sa_upload/userfiles/file/20210708080439.pdf In PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/365e0eb313bc9d49a3c6f9693e13ded6/95555290804.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/sofulititavafifixatikuj.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sg4mcsd4v963hg4oo2dcsm1jo7/43688224359.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/55e97d493c88261d423dda1b56e2394c/xofatoredeleguzuxebujet.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f7feed242428a958db9e0bf2eb5999e6/kekobexomikinifemeritej.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6c5ea01bdebe360d6e4d40bd49d475c1/16154634116.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/63882078414.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca8b3a8b48e74ddd57f2ebcb0fc1a94c/29669245482.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4943d110f---netemuwona.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609867c2890d0---37943022981.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612507f582986---3077017037.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abe18a82b---89832156938.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/dezeripukexudifimipexi.pdfIn PDF document text
    • http://weingut-suppan.at/files/vixawademewudoxekinat.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967bb76ccc7---zimimewuf.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/69147915729.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/85314811893.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/5284250197.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/pupaxovixapoxevepelefam.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/70963201923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mae+jemison+timeline+worksheetPDF 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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10672 bytes
SHA-256: 906fc367d205ed065bfeb0e0af4465bc1de3d7391cbe0843677816be63e336ab
font_02_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 17660 bytes
SHA-256: 837a787644b70bb9c426686ab7685ba83a2027292b6ea640fc99eff8484f938f