Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a1190b3d5ffbc7…

MALICIOUS

PDF

77.3 KB Created: 2021-10-06 06:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ec807362d25d0b2e78d01b77d7e4d5e6 SHA-1: 11c93e8f576b61b5e77f336ed45d682a16c4c8a4 SHA-256: 66a1190b3d5ffbc7b0f38f7b21f1a6c5c303c751129e919164adeafba34e4794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=how+to+test+triac+using+digital+multimeter PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h2v6vh5gdo8d6e17nugpc15njn/57282572751.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gepilaliwaludafopur.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jibodewevorijix.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041128338924.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/tikosifemanorisenumat.pdfIn PDF document text
    • http://ministerium.pt/files/23321781730.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c2cb5cd---46019167488.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/51308328121.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360dc423665---sutewefujuge.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/96849253930.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/79856623067.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/fojafevonukobepulazed.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5102a7ba1deec7db14c2a1db8d8c1dd7/buxovisugule.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wozoberijoferagiruxole.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/81062177542.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109032312331545.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/93745707601.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/60915858798.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/53784876160.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zukizatonuk.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394a849c453---subitiluzigajiwile.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/motubetoxevedu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338e092f025---6793999008.pdfIn PDF document text
    • 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_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 10892 bytes
SHA-256: 6c72054b17be8cc24b171b5128c04a4af04263fc726f38988fe5d7d489993fb1
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 16964 bytes
SHA-256: 918f76d7a553c8ecb7716ee7e80cff7b7a6c22207b827bd512b4bef7ab384399
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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