Malicious PDF — malware analysis report

Static analysis result for SHA-256 479caabf535fcfb8…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 17:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3ef613af0bcf4f7dc3de0ec93207a5f SHA-1: ea44adfbcb46031aa9f00495d8f9f1b1563203b7 SHA-256: 479caabf535fcfb89369e41b6c25eed8b198250442410070fb6cca565de9f91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=to+be+overtaken
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf6mo94j2irabpd4q071ino2e6/penarow.pdf
    • https://atcotourismtravel.com/userfiles/file/vowofobedapikitire.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6b53c201129eb1d92b427876d7f46de2/24798433646.pdf
    • https://cardion.dk/gfx/fckimages/file/35125158706.pdf
    • http://akcjonariusz.com/UserFiles/file/61363863342.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e913e059657310df30ea1096ed20b2f2/95805354101.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/12002422805.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hmstek2bm8valdlc81j7rpm9bp/laguzexive.pdf
    • http://designklasse.de/ckfinder/userfiles/files/vuwufoguneragalagopurez.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b361c03325f82bd80bbfdb7d7b64e0d6/samukofozitukesefogot.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c1e73e56---logulafojutifa.pdf
    • https://actor-conseil.com/files/file/70570004803.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077516280aa2---mebetilijejutivira.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc6888d81---fikiforokizog.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/buzofazipefowokunonel.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/689db156079c138254c09949f9f4a4d0/kumamugo.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_off0000efd5.bin
467810f77804d24ad6055e41a48146f52137dab0ccc640e249fb7e51127cfcef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 17532 bytes
font_01_sfnt_off00011d84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
font_02_sfnt_off0001359b.bin
663c1f6bbfa9b6d78081904598a1bcefc14a6110d4ee16e3ad34ae44bebb5c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 10056 bytes

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