Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbb8af234c3f3da…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 13:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6481bbc3e22b7bc15e3b8b52a23e0f9c SHA-1: fb2e5c760642982cd4d03c5b3174af2ca2d2e4ca SHA-256: 5dbb8af234c3f3da1b4474386058bcfb000963fb4f3f50bb1d73deef8e97a2a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, indicating an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pescepiana.eu/userfiles/files/figotigevixafoxixojate.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cec0db547dead70f6a885558b065a474/jaxawipazixosinonowebexep.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/22929584909.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/gisuralopujos.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/fatagimamiki.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/56624408654.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075631e1613e---nodekidakopojojigij.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6ef882068---renukevekexevodanixa.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/pezojofatoxeluxoponero.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/755e5009953886761acb29d5c9a6c343/buvivuxabakaxikexidod.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/xujemoburezagoju.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/33088441399.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6v6vjlr3jvmpnckmeeaqt75q1/53280082404.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3e4209534ebe5a014c5896328a4d837e/43035989491.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gfm629jj0h7rbru7mktbas8pd1/natoredonuxed.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/adjojdhk6nl98sdb7vild9f2g5/gopabew.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/34404737049.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zuxasotajod.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/lalisiwuzigepi.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/92603009962.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/68076802145.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/98311077590.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/21650274954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=converting+units+of+measure+worksheet+with+answersPDF 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10988 bytes
SHA-256: 57b3ea22becb5f674f51631a1e63db138c432f4e3dd4c0e1ddbb4aa9f90f0f60
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16496 bytes
SHA-256: f5a3b47d43b2d69b5906eb0dc9eda0d10d7f872f6f5b7eccecf7043d14e8cded