Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ab45266be11ef6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 04:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a1391b1d0fa133f0977abe87ce6c856 SHA-1: a7d0ae7ab441d888d4f1e27b0537c4001389f344 SHA-256: 94ab45266be11ef6bc555a1ac96700a39cd635c337cbd6d44d2e88dcc771ba48
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b01a5057c---25730415.pdf In PDF document text
    • http://envigest.cz/upload/file/75587061083.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0034b2e7e3587a3b6690b042e8a208e0/zusejujufosewepogudusubom.pdfIn PDF document text
    • http://djpress.pl/Image/files/35398076016.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/90671445899.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/75315064024.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/pifejokifumizutojosazeguj.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/wofexefeme.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/18584793600.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedc4730c04---17864010625.pdfIn PDF document text
    • https://www.stavbyhes.cz/ckfinder/userfiles/files/zosul.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4b8405c37---vazififekulerume.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/roxiwoxisanilaxafor.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/31402244043.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/64545135595.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e021fa45678---26755338009.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/29997492418.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jopat.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/73485605209.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02e703fd48---44954878036.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bd433738558364fe28d7e3107adf8cfb/56760775192.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/42526340141.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/41937244984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=five+different+types+of+chemical+reactionsPDF 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 11044 bytes
SHA-256: 47a5e1c1d7f9623ba8d5090d6ae011c8864e03d65a088c2b564c211c9169181c
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 17780 bytes
SHA-256: 6da5b1332ddc756a702c9a0f6957783fd616d124800eb54126e79dde977c3815
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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