Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7643d7d545c9ae…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 02:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c33e9d42424cbb21cba8b7e20ce8462 SHA-1: a2b5ca6d2c1a9be518757605e8e3b2aa1adca51a SHA-256: bf7643d7d545c9aeb664787da892136dcb198c4169ffd73d768e437bf3c2014c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains identified as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide clear textual content, but the link farm structure is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/473486a64c8da233db7e168117528773/mapowumudikodidologukab.pdf
    • http://architettosbaffo.com/userfiles/files/xutavixukoxunen.pdf
    • https://thefertilizergranulator.com/d/files/pujomubavomu.pdf
    • http://alnadaoil.com/userfiles/file/faxomezagegaxix.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mekowagomariwogiwikov.pdf
    • http://loscogliodifavignana.it/userfiles/files/zogadopopuvi.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2cp3vf1v4empt3bkb6qfpk47b3/98239854124.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f37a57ffc---tedebi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4da95bdd8---buketira.pdf
    • http://armanetti.com/images/80155174482.pdf
    • http://nfc-lampang.com/user_img/files/petugelotutemafedoril.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/sikozefezujeta.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9571617ddda74f90333dcec3d49dc081/rifemigolesigewir.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161037f640402c---kaxabexujapo.pdf
    • http://mikomisushiwc.com/uploads/files/73798258830.pdf
    • https://signika.pl/Upload/file/85177114898.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/282khk5nrffvihl6d31fs5n061/filevow.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/77695145504.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a15104bbdea---83050829485.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/nitisuvuwukawugabur.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083d9ba2a8---91005597776.pdf
    • http://pogservice.ru/userfiles/file/jebogiwisipipoxo.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2aa448d8---18470261085.pdf
    • http://signauction.net/userfiles/file/41933597107.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/senatozom.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8e66b41af0e4a38101e841d2c1d760d7/kosutawaminelozujawafofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=quantum+mechanics+griffiths+3rd+edition+solutions+pdf
    • 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_off0000c183.bin
6a33796e45425d7b33362d38a02c626f26668cf4848decbaeaa2de43ae21be02
pdf-font-stream PDF embedded font (sfnt) at offset 0xC183 15748 bytes
font_01_sfnt_off0000e91b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16792 bytes
font_02_sfnt_off00010132.bin
80c7b50b1547b82563e771f23216fafbc2e32fdc7d7cd53a61cae6e89d73a53b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 11396 bytes