Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb189092fb88241…

MALICIOUS

PDF

93.0 KB Created: 2021-07-30 23:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b0eacd6c108f0e1ff3cd872661aa707 SHA-1: 15fc66a236faa1b09f59ac4fac059fc380ab959e SHA-256: cdb189092fb882410b4158070c18dfd585aeb3dfc9e38e9c552abe4a9789b654
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness with high confidence. The file contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3fb342cdb228e0c0390e293f8f6e9858/zirolimivibesamavotasive.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0e8a6366---pixiwatuwep.pdf
    • http://drapa-technika.cz/UserFiles/File/gibadofawu.pdf
    • http://jeyadhurgatemple.com/userfiles/file/27305532682.pdf
    • https://cortopolis.ar/userfiles/file/vugiledimamorixogozivopap.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/c0ab3rd9nu02815td9btmrr3mf/zokuzadupelavuromuroru.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1cf70b45---73143979067.pdf
    • http://j-line.ca/fck_upload/file/53932656744.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/brc3is5ucrdto252176akbrb6d/bojiva.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e077dca0---57945615097.pdf
    • http://mini-garden.ru/userfiles/file/tovonivatofuzerazamuge.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7875093ae---56050075836.pdf
    • http://sigep60s-ncbeta.com/clients/44785/File/wufokomorawafedos.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f788afcd1e5---sekudabosa.pdf
    • http://jrpst.pl/userfiles/file/nagowurozifibopo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec6c57b2a---14961630031.pdf
    • https://anfauglir.com/images/file/fowopo.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/kisad.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/71734886df8310f4c2c640e5f27a766d/loraxiviwiso.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/84sr46ad5huf1r8gsq5omt9jtg/nalumisiduxisepuzet.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gv4fq9nj3fe9dmfsbc831p1c0h/ponaligaluderowubawifavu.pdf
    • http://royalgoodviewresort.com/Uploads/file/ketowijewi.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/84535925513.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=problemas+de+planteamiento+de+ecuaciones+de+segundo+grado+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_off000102d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16792 bytes
font_01_sfnt_off00011aed.bin
3f47f8e9b928d0f0d84ceb626a1d110e6b6a20210ab25dd744088b14068018bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 11204 bytes
font_02_sfnt_off000134b0.bin
c0d7b39e58b31aac6204ccba49b8bbcebdaf9b6b676407c20a066d400a9ac524
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 18708 bytes