Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1298d1eebc487e6…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 08:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ea6502c5c68d9c5da75a7594843588e SHA-1: 384dccd71391e36563cff37c1ef0e9eda3ddda13 SHA-256: a1298d1eebc487e638b6ce8e6633be63b181308f46532ba78c4f9ae173dbca40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the heuristic firings and URL analysis point to a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=white+blood+cells+in+pap+smear
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5eb7daf7---togivigoguve.pdf
    • https://alihuata.com/userfiles/file/koruliteralovo.pdf
    • http://yomamasushitogo.com/uploads/files/xoduresubo.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9dd443b4f0490671255fe44bf664f5ed/xixemagiguvon.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f1c613a9---67317083498.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde195cc1e---56561017261.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8c0f42282986a280afdd4a62164f52c0/22361137909.pdf
    • http://vmkmsz.hu/userfiles/file/93237489515.pdf
    • http://ibb-online.ru/f/file/butarejile.pdf
    • http://strategie-online.net/catalogue_dynamique/file/41525340025.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b18caf82db0ea0058d9a4b91cc026832/rujevaxidezezi.pdf
    • http://cec-intl.ru/app/webroot/files/file/rakusolugadese.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a93bb5f78---jugijulugexowivuso.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e46073a3f5---bedizipol.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160933ee6a7e36---pirozojoxewupozaz.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3c60d5f1d2534a2c94bf0f7afb3db7e0/dixunupupudufesudesokor.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5acb08e025f27fcfc7dd452e6375a5d6/92558196520.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nexomugonodapo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcb38491a0---55538270110.pdf
    • http://fixafilm.se/userfiles/file/nilopagof.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/37248a5a482c870cb0367a79fb21d012/12310890772.pdf
    • http://bhs-class1957.com/clients/35434/File/sojikata.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28eeebb370---98223335507.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe69a9c65---rozanidigadutamuwo.pdf
    • https://clinicscrm.com/img/files/talifivox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16792 bytes
font_01_sfnt_off00010284.bin
248d977a745188f3734ae339732f14a0059bdd33931d680abe7f51fa4a3e3578
pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16508 bytes
font_02_sfnt_off00012d53.bin
f785f8f867fd1557fc858f785b6bee8fb4a53885dd2292023425359c02a9fc4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10912 bytes