Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9555ad71feb7c3…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 23:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e4a2c763a6fc47a3ad3c753e9990f9c SHA-1: c3a4dc2368de1ad8ee8fdd7dc8554c1ccfc3783f SHA-256: 9f9555ad71feb7c3587914d81f4eac0695acf83915855a697c846934235d9027
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on compromised websites, likely serving as a link farm to distribute the scam content. The document body is heavily obfuscated and unreadable, but the heuristics strongly indicate a lure for a lottery, prize, or parcel delivery scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b624b4fb4d65c59c6f5bdd9d09490aa3/nabiliket.pdf
    • http://restravel.ru/ckfinder/userfiles/files/nujipisifumamin.pdf
    • https://artbynela.com/uploads/file/65234262063.pdf
    • http://elisa5888.com/shopadmin/upload/files/94009992594.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3a232113---88057392366.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/144493252973bfd27e72c9d38f996bf1/68540802288.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e32e86853---3408970863.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160872e2756c15---wovoviwid.pdf
    • http://bike-aholic.com/UserFiles/file/talifusodesob.pdf
    • http://www.hangmandigital.com/files/file/12624747218.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06006460f3---38284312698.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/m4sqmne7q7248asle103oq0h26/81042360924.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/fb7ddecdcfb8a1db4506faef13b15590/dijepowunepemevubolaxife.pdf
    • http://mp-journal.com/media/file/ratimopetopijububuxa.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/dc6fvgodd2s4ls2rnb79brhmk0/29038691429.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9b5d44fe4572c1f9d4706d702b7c4f85/mitatapajul.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/74589118295.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca62791812---luzule.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/31345377852.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pr84hl9s7bmehokm53fsm2pb55/53410907688.pdf
    • http://sjar-tech.com/uploadfile/file///2021062012214384.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/fuveg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=uno+extreme+cards+meaning
    • 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_off0000f811.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 16792 bytes
font_01_sfnt_off00011028.bin
3b6c9546d68c4d7b173d2366576885a0a0fc4fb2d15c6c9302f3df2dc9f891b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10776 bytes
font_02_sfnt_off000128c9.bin
ba5c628671ec4b1131354f6e78a81e57fabf7789e559ed979b33569a19bdaf8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16508 bytes