Malicious PDF — malware analysis report

Static analysis result for SHA-256 00441f849d3beb11…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 16:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a212d663a8c8f09013046e523f8fc2e1 SHA-1: 8d3c304bfb979453cba6fa1fbb29a044f61c3ee0 SHA-256: 00441f849d3beb1161c77c52131c3d1850fae6d768ae3701ef28513dd6b27eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a24e3d0b0693ba0f6017c509f9c75df2/6469621304.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3ba8b675---jukasowiniruve.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/donuduw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2450f98e---31927692143.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2684567c645b65cd81a794fb4b766155/36326118342.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gfuifk84u63j731pon3oj0v5tp/muwurik.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/66749021254.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/38307937622.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a60d8234a7bd66c416f07b67c2cc4d9d/digolevasubavewefu.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/vizexekufita.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33283634668.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wapixakuzesutemaweji.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/mopowetenefipek.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ceb73c31---90831516588.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tedogibijiguminaw.pdfIn PDF document text
    • https://medtek.vn/storage/file/89001966924.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34e2b46cd---pefami.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/gokevenerutoteduf.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/luredegajad.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/adre0ri7tg82gilr77vv32s217/vomigafepubamip.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e19f76b1b---tedovagagoreloziwulidili.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/2620904744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=why+is+my+hp+deskjet+2600+printing+blank+pagesPDF 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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 11596 bytes
SHA-256: 6f145644d270d823b520854796fbe370f0935055e69aea589984462b4b096afc
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 17200 bytes
SHA-256: cb537fac979e240e637a7cbebef1833d9de18e0f2c8f81729cf297a7cda432e5

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