Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fe3eeaf6de8ca9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 20:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4793486bf8700878bac4732b5693068b SHA-1: 0879cb18b0e769fc303b7497ba9088cf13a31d3c SHA-256: 12fe3eeaf6de8ca917140805b7dfa21316a46ad19653b4319173bac1e1b7bca7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish credentials. No scripts were extracted, but the structure strongly implies a user-facing lure designed to redirect to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe45253c9---tufimuguvewolosiwisa.pdf
    • http://pogotowienaukowe.com/Upload/file/wolapi.pdf
    • http://tinhdauvietnam.vn/upload/files/wagukagujewudexozo.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiletaxadukadoferefilubop.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/vuwakilelov.pdf
    • http://gabortech.com/admin/file/23430144336.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7464044b62e56f4da2d5c87e5fe2c252/75682241547.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c2998255983---nurasuzajajumis.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ptdg7k5n4g3t60ma1vqbj7kd67/75380357034.pdf
    • http://happinessgown.com/upload/users/files/lokikoda.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94461601724.pdf
    • http://f-okinawa.com/img/tmp/files/95633371241.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/578a797b1ef9e442f529d3701c84201b/13922362306.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd387b23e---95762128070.pdf
    • http://gyuco.com/uploadfile/files/20210808_041207.pdf
    • http://baraanduliaptti.org/userfiles/file/dizob.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/29160834811.pdf
    • https://saunadlaciebie.pl/userfiles/file/gebofasa.pdf
    • http://vita24h.com/uploads/userfiles/file/7133351362.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02cc4920f2---76502049082.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/44947698197.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090b84d5655a---83105709004.pdf
    • http://www.lugashotel.com/data/editorfile/sukuvesomewiwesokifopuro.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/xewazo.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/keuf7vfdf60ba9o5rq27hlsqsd/75344573190.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2005+pontiac+g6+repair+manual+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_off0000b159.bin
dcdb8c98d6abf069198380ce1f4a46e8f4b76a1520ea05e8cff18a571a415d17
pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 11340 bytes
font_01_sfnt_off0000cbe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 16792 bytes
font_02_sfnt_off0000e3f5.bin
cebd467df64f4ab412b08b9ceeaef426febbe040863c87d0e2aee9f8bb694d14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 14056 bytes