Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1711de6e67ac6b1…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 07:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c40708fd36928bb36d5c41ace1027bdd SHA-1: 53b99db90ebd887b9aff5dfb0a8599ef919bb41b SHA-256: a1711de6e67ac6b11b57ed1971004262f3d5d1720bacf81de06888ec05a60f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it may leverage embedded PDF features or exploit to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://transcash.com/ci/userfiles/files/subekuz.pdf
    • https://aawyx.com/sites/default/imageuser/file/jamafag.pdf
    • http://marketypik.pl/zdjecia/fck/file/76582366954.pdf
    • http://z-i-f.ru/userfiles/file/ralejawi.pdf
    • https://systematix.pl/userfiles/file/63673217007.pdf
    • https://amrapalispot.com/userfiles/file/1264570733.pdf
    • https://al-farh-iq.com/upload/userfiles/file/javawakevilu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607faae6b0baf---wasixanusipamuxabifefuteb.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dbb5f30717a1f88a08b5de9df764c600/19731641777.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851dbc83876---97082396356.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/20vts7cdsaslb2ke3q8jmmrcis/94230063801.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744f5778067---10798599684.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84618f0a9bcd179d8e3423a8ca57efc9/robakatogo.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7477030c5---wiserazudozuzilimala.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccde94b66e---bedekum.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qrcudc53u1lvp1ou0kffoqbud2/wapepixusarowo.pdf
    • https://x-software.cz/data/file/pugudeturop.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uchvtkvtr60nnvvj5vnuqm43eg/datilaxuzogagofi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160becd10792c4---lokulunupuxefaxu.pdf
    • http://sys-svinding.dk/userfiles/file/lufedinor.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078093d4aa53---xipinajiroxuguzowuj.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8afd86bef797c4e55b1be4850b4f0d40/14563465375.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k8otc5aneuaipblpomue9brsqs/65992975491.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd3e48cc5---deregewamasinubozugiwumid.pdf
    • http://lakesideterracecondo.com/clients/41361/File/77283657477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=video+streaming+industry+analysis+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_off0000ec4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
font_01_sfnt_off0001045e.bin
9a990d2bd1e66761d76993db1d92f9d333c039b893418869099551d4ecd57009
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16988 bytes
font_02_sfnt_off0001307e.bin
d144a8f8f9ebd00d3801391841b1b49490eceae0731062289657ba56ef0fddb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 11024 bytes