Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff75284c2d6c11…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 19:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3450ce0454663946400774c970d18bd SHA-1: 295da832f5c69bdc9bc5928fb49b962db795e8ec SHA-256: c8ff75284c2d6c110745d00b5f05c66ed0a9caec261db44902bb9a3aef8d473f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to various external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=level+72+impossible+quiz PDF link annotation
    • https://aakritidigitals.com/userfiles/files/pigesavabew.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/36052315537.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/29266835735.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/dinib.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vobotevitojosasi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad31c0d946---22048977045.pdfIn PDF document text
    • http://wamer.org/userfiles/file/42441253149.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/45270567994.pdfIn PDF document text
    • http://dsagco.com/Upload/file/gejazemak.pdfIn PDF document text
    • https://atrax.hr/files/bemaxis.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a32c8df19a---pajowerosujipog.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f19d0d5fd399fa4e93ed01e0dd50f7b6/68732238771.pdfIn PDF document text
    • http://medi-sen.com/files/files/56095206853.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/reduleba.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/piraki.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614692acd5450---5061515465.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140591c33e94---texitofazo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec2aa8ea4---jowajexelo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/66384775162.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/motemanibafafanevagazoz.pdfIn PDF document text
    • http://khocabien.com/uploads/files/35225835732.pdfIn PDF document text
    • https://codecs.ro/images/file/sesuzakurewobivisugi.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/87140826747.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71774049298.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/sufejetoxaxupob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 10588 bytes
SHA-256: 1bd15c47db3a4a78111fee73fbe41a7e2bbe690864474e6a74c16c113c03632b
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 19104 bytes
SHA-256: c72fe9a471f95f9dd2d3691d26732c27089d10cf13a69e88b5f54fc48fd4c31f
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1