Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b249fcb032743e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 11:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2bef07bc8824423d953123beceeca71 SHA-1: 610ffa24d613b4562bcced9facff77d88cc68d71 SHA-256: 27b249fcb032743e81a77814cdfe884266aafeecce14b7fbb186e719ffbd8385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aradmissions.com/ci/userfiles/files/novuwodijabefofe.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53d3dd87f2800fbf7099632f2f3db339/73057267025.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tosamunavamesulugelovi.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/85910107302.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/gerumajebijibekukud.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f6a951cff73872577fcba21ca611280/23955334682.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d805c5e7---39339266658.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/52177394436.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/69296803926.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/woxisolokal.pdfIn PDF document text
    • https://discoverthesky.it/file/sokodukisixonesozave.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/92781252581.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xogaduwaxopipugorirutoxad.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/88150520213.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c15902c565d---sowazukuk.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wobimakimap.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j585p2cts76tv0tqd9qje3uu2f/19645460492.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/43069726426.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5d66fca99efc86948e4fee4e5decfbbd/41082883303.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wevofaxaguvusudop.pdfIn PDF document text
    • http://aweibel.com/Photo/file/89130744428.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/70296453613.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/wixafuvanevopagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=algebra+1+worksheet+multiplication+of+exponentsPDF 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_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 17484 bytes
SHA-256: 63c58be31674d02bf52d6f995b88f9ba3571c9101208e9643471498e4c894b8d
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 11480 bytes
SHA-256: 568bb67d99140f4792cb15e94dcdbcbc777eb204bba820296dd4b25721aa40ab

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