Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa61988542804365…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 08:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea552cf1270c1d54902bde41b5790f51 SHA-1: ae1af9124ce5240d5d507d9ea7b87d7c1a86e3be SHA-256: aa61988542804365a877ccb8afeff49f47e7a4b39c610ce45bc9c40b7a379a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://nomylo.ru/uplcv?utm_term=nationality+game+worksheet PDF link annotation
    • http://ediliziaunoaventi.com/userfiles/files/bisijozasukopixatur.pdfIn PDF document text
    • http://ropesadventure.com/d/files/65780604648.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078222842d89---topijajanevodubanexab.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/bitelomafojebebexeda.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e96f18c3---56120691639.pdfIn PDF document text
    • http://allycatering.com/userfiles/sejajelatopabajow.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/juzufenujamonokapezenemis.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51fb9dc05b---80558300394.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c8fca0d392---57328409628.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a479a4d12c7---zilege.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/68527636625.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/daxogilizexopoluluved.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504002632709953.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mapovamafinadusutuludulo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1aab634b274ab3ece5b2c36fb3594305/negifejepawavobogabov.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/54679183269.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43953819128.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d9431a54---vajerutefapunifobeturu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6f76c16beafa23a0d3707e850653319f/fakojujazekebetilubef.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b99db57276c---nurufewogisenipope.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/80461478559.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xuwomuxufone.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160950c64a25fd---podunin.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/bb0755c983d185f8466848c2c52d41b6/pabofopubagafasugubegum.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nokigalanapamug.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/47090804440.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92d824e78---7224117928.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 17028 bytes
SHA-256: e4b3ab0e07b3075a2fc15b3c573cd1c0d39ef00dffc88d61f2abe1435e0ed09c
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10824 bytes
SHA-256: 42121f5ba530c568aee1d93c45f9fe11c4b7c137413cf755818026de8d352c69
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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