Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ef08802ba5e89f…

MALICIOUS

PDF

88.6 KB Created: 2021-07-18 21:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a163b4152978d292ea00a5743bb939ac SHA-1: 4989e4dc50ee7ecf8619915bc91f923f68b72ae7 SHA-256: 06ef08802ba5e89f464e0fa44ad07df425cc970ee406259e2e1b54d06219ca49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. Heuristics indicate a high likelihood of malicious intent, and ClamAV detection confirms this, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a319d0f988---valifogaxupebaxinogo.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101b004dd0---57411498887.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/44e86053c520e40a4e3f124d97b3626a/30747833825.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/53343849570.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074707a4c1c9---28889093683.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/97c204aabb06faf6ee1a6f607968f0da/81917873073.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee64ca226---jezokugezemunemutifu.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/vuguwojovikodokawegulafo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4248a41080---67286236888.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9bcadff7ebc9d85b3ddfeb587c852306/bujawodisogugo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/27100615452.pdfIn PDF document text
    • https://avflash.nl/upload/files/30037586977.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fozibunolozowulesivox.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nimutisosipesizidiker.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/40388766687.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/ragajonopawumofuwalidabe.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/gikeletejulasi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d91a09c0f865404d29046fbf8ed2a63/selalijamu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622e573405---95162573459.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/zexig.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7c5eba86---41855222874.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83300cdd2a---sugalevidew.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/97673047825.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/65033022812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ap+statistics+multiple+choice+answer+keyPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 18860 bytes
SHA-256: 047922c4021e9eeb6cf36d32aed5953a34eded80e2a173eb9af60e51768c3098
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 11012 bytes
SHA-256: 38538384bdaf0382cc49a9864a0ae7ee6b10094c28c08ea2ac82d11aaf091183

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