Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa13ad4773c9877a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 17:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ee491e74156e7ec94cfb6bd237ec23d SHA-1: 52883021f9d8f79eb1c26791adc6182df97bd2cf SHA-256: fa13ad4773c9877a734da698746ff4bb5ffeb7f1b3cba54d4ffaa031a3179b90
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous links to external resources, many of which point to compromised WordPress sites. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m65tpfp8vs9v9p65lrid2j1483/dopopetejanafiva.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9926d8a75---jojep.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8d6909aa73cb80dd037ed680f711006f/55408289458.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5db033e9055be9232c3ad5affb7f3739/zukozasumerevajugated.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jojavusapof.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210815_205427.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/69036590997.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/wuvisuzezivuxewixevupiku.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210704215614_zgnkds.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075aba665852---mifipinidubenijofisas.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99e0897c8---73590245146.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb557215---38143176936.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe750cfb75---bokapujivizuvugopibu.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/91304442772.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/38505337798.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/85a53f7c4126abfc70456c010febd6d7/53472410659.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/79017814541.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f65b3bc049a0104b6c03b1e4b4880a86/88623952139.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/kasexatamefa.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/22665574859.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/98376492836.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ak94b7mr1lvch8h1ago5kfvm07/16875004636.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/rurefogir.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/63722679775.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/964638b21e01b354a332117f65513817/32515878244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=past+perfect+simple+and+continuous+explanation+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5f709677307eed825d4299aaed8d10b/xafuduzini.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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10984 bytes
SHA-256: 162aa85edb1c2b75c0acd15c803909d7de86cc1d05cc83a88a78c32f4f4b94d8
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 18924 bytes
SHA-256: 5dcd68389cd281da8f4b6cddfbba9cf3f8b4075a5e248b88847cb679aad176c7