Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c1d99479796935…

MALICIOUS

PDF

99.6 KB Created: 2021-06-25 15:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83b45f6f0bd4d02de1ad5d624efbf164 SHA-1: 3c932bc364426ab242b70b297dfb28dd7cc92710 SHA-256: a0c1d99479796935e24f31d6be4fb781644bb545cef4fc928fc868a6cdf459b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to leverage external websites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/61f329ccf8f11c4a3b875bf19802eb5c/57185414964.pdf
    • http://tubietelbar.hu/uploadfile/97050614423.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8857a3f01e66942262b80fd8ecba336a/lafenuteduxoratewedodoj.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/75195423671.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e383f1f1e5---19085941193.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/42732610327.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a038139a6f51ecc84c324724613b0bfb/44800700947.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/24800197407.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/86dca22dbf11aa4d394bd07ae59c613c/pomelukapopin.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae092396958---11784493196.pdf
    • http://annandale1963.com/clients/69704/File/lamufi.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f1115ab1f04563741832359159ff8948/lojamavitewitizizeze.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lottj501db1lk5afgfv6ocnnkf/tujujemuri.pdf
    • https://turismoporsantander.com/aym_image/files/xifaral.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584ae7afc4---48433156746.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa705c67ec---98003693329.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=self+recognition+psychology+definition
    • 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_off00012021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
font_01_sfnt_off00013833.bin
240dc46ae8c9615568c0cbd93025b3419463fbfeae951e921eca638d7c3c325a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 17896 bytes
font_02_sfnt_off000166c1.bin
8c0803f260a57e0db998c4ab1d129734d8b84bd42ff1a12b2ffbddc7cee7cb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166C1 10928 bytes

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