Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf1f828336a6379…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 10:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0f40affbdb7cb3846185dfef7c64858 SHA-1: c3fb5da3d43265cf506f3ca89cf2965037d41049 SHA-256: dbf1f828336a637941880f01bb88085f6fa33ec73e6b4e2329aeb9bfc28ebe8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/k631lcpgotstuupsddh4fqag96/49158067294.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/87438412523.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/24887860892.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b5aa48578---77476500119.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca80af2a1d---wogizogepixugijenakilidi.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/55029432607.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/94006780244.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/16912962501.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tavudivij.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/voxuforowo.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/zezupanevuwen.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb0f763cb5---mopituxolamu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/48238719805.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/jebuzesirufegigitidemim.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d86e873c0---63873696675.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/57769179352.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607073be017f4---zafativexizovof.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c64c16ad05a5b622c156a6b1b951ca0/52730581367.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/33432721250.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec952b52aef---30657013452.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rumevupo.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/97595845336.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e3351123d---84750527553.pdfIn PDF document text
    • http://eva.am/files/fed4da587560eaac.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sidezago.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/mokisemezemisixebalakamug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=u+verse+s30+remote+manualPDF link annotation
    • 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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 17840 bytes
SHA-256: 353cb07565ade27c69ce205f7254e1c33b097b50ad3d9da39348a423007418ea
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 10644 bytes
SHA-256: 50e7ef4970a8d30e42550f654ccc18bc1a1af3fe729f2ad9677173d7ffb6a6d6