Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1e79f50fb323f0…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 02:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1de776717aa031f94570d7b9ef8af20 SHA-1: ef1aeb3b4432d20286296e3f7328ae8609c33546 SHA-256: 1b1e79f50fb323f05ee980647b73bff90b09d00d6962c4cd86bf1bf187ca5f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=toned+abs+women
    • http://jpind.pl/userfiles/file/73246186288.pdf
    • http://appletechsolutions.com/userfiles/file/mokiguzevuto.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c0d2d94f541fa7f82258661b6704a354/fitulobesuvuvikate.pdf
    • http://beautybybelief.com/admin/images/file/kotojekexup.pdf
    • https://shop-ecobati.com/medias/upload/files/1002720813.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f191265---98484948751.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8464f7d29c9c62043dc41e66dbebd128/lelebugivopogaxamizumeb.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b754d687---60005298480.pdf
    • http://n2nlah.org/UserFiles/file/71689864847.pdf
    • http://khanaphatgroup.com/UserFiles/file/zuberepiwozukit.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784c354cfa8---76980773077.pdf
    • https://pabrikangka.com/contents//files/41800523554.pdf
    • https://highrise.pl/file/89944578759.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e50688cf---50927389141.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3md2juaojvel2kmr8kdt3s4blb/juzajado.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/87ktknd0ckjqr0gscvlaclkvu3/bugasu.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47b493410---devodus.pdf
    • https://securitydm.com/slicice/file/susino.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/33jq9ot72965k1a79dga7gb7i9/kizexiru.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/83f88cs38ipqgobp3q6ai37uvq/73508019897.pdf
    • http://wccflooring.com/userfiles/files/xirofimujipi.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/bv477riqdu6osljnsraj9k77l4/7563766066.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c875ea493---begog.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_off0000e973.bin
1791c706a42b165e3f0bfead9931b514da457a4b400a1967f327a8c5d18de3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 17916 bytes
font_01_sfnt_off00011894.bin
f0d940d5041f6a2cbf19538fc8e17897fd8f20e813503beabb8376f41f191069
pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 10264 bytes
font_02_sfnt_off00012fb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes