Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff587872edeaa0a…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 02:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23fabb3d886260724f964d99a07a9118 SHA-1: 1fcd1f87bc46e665a9cd4cad4fb9cae8967fe385 SHA-256: aff587872edeaa0abc9d8f57b6ae28a2286b6998e8425e208489ada0776e60da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farms on compromised CMS uploads strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=over+the+hedge+squirrel PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/52a53a34b089f2c134a42489d1fb2450/9895091878.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/92206366703.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4355a171---87427182524.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a9e677bfaef4b223ec54afaf96da8db1/tiwipobodonitepukomitozom.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15c6e3bae---98656047734.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/47108941080.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vmti3c8cqed73ueaorhlrmih4i/77832131792.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/facb14cb9a53b9023aa2fdd680c90f70/94145606148.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/lutizoxebizisu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a448559d32b---92441621855.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0a7fd3d8f08cb19dcc263d6e23b9c5a/gibuviwepalesasuboja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fojumuka.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c784033b9---64917512484.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/lenivar.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8f2b24c9829096b385e59fa5185cf4f5/xezidegewowa.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/suvipabanomegeforonedim.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kaxupiginaleponutaro.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/936062b402a93596d1752d2f51b654cf/xalesebufefugoxo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf94e10b1---butoloxekofowenekoteje.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/61459481868.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e446ad4f63---joxoxibawodedomeb.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609befae936bc---popovejisebizolusujifa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecc5d0f55bfdaccfda077238c594ce89/nakuwa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0534a92a---18199693436.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/bd06ffdd783333b0b296439ff39391f1/jizivuzixiberenafomotoxe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77ec02d93---30257613401.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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10476 bytes
SHA-256: 7f064d18441ca0318d73851e9f30546bdc84f74ba0b2960d1bea4158bc4b99ae
font_01_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16840 bytes
SHA-256: 92c49bc905c14aa81ec8569489067ca684e4152f4d70168c0adbd5eacd5965a5
font_02_sfnt_off0001407d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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