Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ed260d48b5047f…

MALICIOUS

PDF

79.5 KB Created: 2021-07-18 17:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb1e5702b8626bc5b95d846a709ea509 SHA-1: 9e6814977df0b249e9ee8d27fb5db63af420286a SHA-256: 73ed260d48b5047fbba084bf6327e870d2de58d4eced02b47889164ec352292e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zanhotel.ro/beficientconsultingFiles/file/62406898530.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/8158076734.pdf
    • http://ceskylakros.cz/userfiles/file/40060090343.pdf
    • http://musorcentrum.hu/files/article/file/miruxagomulafufuz.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b0996917d---munuwunexamubun.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b753df15---jedota.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/48f3b6458e160f2acfe8a3751ca448c4/vamuxerefemotifafozebesad.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lj8rd4husn907q3cn715vpqaac/35554757748.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c504e698069---refetajesujopenes.pdf
    • http://mamaskitchenorder.com/uploads/files/fokavozarevusizowenimo.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/84dd796476c9036fb0cac1aea0ce5d32/81265661520.pdf
    • https://fl-forever.com/upfiles/editor/files/dewajonefu.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/eafaa62effc8d89c90c2f1f46fb7080a/mogobij.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079791b92e08---17445626136.pdf
    • https://pinyardim.com/calisma2/files/uploads/genuretagad.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d2eb687---71338178162.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8b4fea8275999efcce534db1878e1623/ledaboguxutubulumuro.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/92554aa7bfdabfaeec782966c15ee815/92189572745.pdf
    • https://htddienstverlening.nl/userfiles/file/19152952030.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vjt7uas4harb1dedrf05u4f88c/94969087262.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a15875d1b---8596453043.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/38gkmnaqin8n4kv1sv09i07dg2/39923793771.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e867428b6---selafiterixifet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ms+sql+order+by+multiple+columns
    • 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_off0000d3bb.bin
1184ca0ee4021bd938ae75d04acc0eb22e05cc7311e9510811ce00f55a5fbe5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 16800 bytes
font_01_sfnt_off0000ff89.bin
fd17d5838b86e31b2ec45be8b0219978edad08507bf7563d2477b1c82cd8bbba
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 11004 bytes
font_02_sfnt_off000118ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes