Malicious PDF — malware analysis report

Static analysis result for SHA-256 3963735610b38f2c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 18:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4181773bdad2e1fe50ca940a4092fa2e SHA-1: 5c6a403ed678df9e874f3ae4c5f5b5611e2b63c1 SHA-256: 3963735610b38f2c943634374fac7772ab51c480e36e8effdd632ceffcab580f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a411cfbd---woteratalixifefo.pdf
    • http://dilimkebab.com/userfiles/file/ferubiti.pdf
    • https://zemtechnika.lt/public/site/0files/65864099360.pdf
    • https://stallion-international.com/userfiles/file/11068163771.pdf
    • http://e-sportis.com/images/upload/66691026919.pdf
    • http://cl-metalparts.com/d/files/xudowaponiretezobevu.pdf
    • http://herium.net/FileData/ckfinder/files/20210906_B8CEEEDDA2654980.pdf
    • https://butyfarm.mm520.net/userfiles/files/91644636492.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pewuzoliborasovane.pdf
    • http://sluchatka-shop.cz/files/upload/files/85917942293.pdf
    • https://atcotourismtravel.com/userfiles/file/wazunobiwadawulidumoku.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2d32c5bb1e7ea2c9c8a57f3000c38039/34765102532.pdf
    • https://sanaspinler.net/calisma2/files/uploads/buken.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc3eaac9d0---pabokavabumukokejusarabes.pdf
    • https://metricgroup.it/uploads/file/dekolatilibalenizexuz.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/7552165669.pdf
    • http://digifast.cz/userfiles/87493298558.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613166b4f1aab---97595266729.pdf
    • https://willes-gb.com/uploads/files/202109131322341314.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/dojorexojibifug.pdf
    • http://teedinmaesai.com/user_img/file/92752644961.pdf
    • https://butchercurnow.com/img/shop/contents/42958435756.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210907_094545_123.pdf
    • https://huaienclinic.com/uploadpic/files/gusawenosabazebafof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+fire+mod+apk+file
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea6.bin
690df74cab70d47fb3a46c28f2f6e4d1a995dceebfaf72f52337aab06ef33346
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 10360 bytes
font_01_sfnt_off0000d5f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16792 bytes
font_02_sfnt_off0000ee06.bin
839927b554db8e5f062e68d010334c0eb2426f61d0bc74fd82d11385604dbdea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 19652 bytes
font_03_sfnt_off000120ce.bin
b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 16148 bytes