Malicious PDF — malware analysis report

Static analysis result for SHA-256 316c76afb92377b7…

MALICIOUS

PDF

136.8 KB Created: 2021-06-29 01:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a0da0feaa8ccefbf052147ed7bf35b1 SHA-1: f05393705b66de07132c8fa4f5f53acd8426ad53 SHA-256: 316c76afb92377b7a3e4001b0fa2fc5ef32db6c0d0fd0ac2545c9e8bd6250860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. The presence of external URIs and a high number of distinct hosts suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=ash+barty+latest PDF link annotation
    • http://imaginove.eu/data/Files/jelatipudetutelebu.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/rafawexuxavila.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g1fllqmkd9h5oq0gc4d6e09ed3/punozokolipur.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2lcqjldhtacgovhqr26703iuo5/nexekadelerekeme.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49194dc957---wemedoxakozexobewunikarux.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/kisebifun.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a36806588---dafufuwametivaxiwi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb579bdaa---gisutu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/79336651149.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50335f965---77306309140.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/zokabasifi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/joriruzaw.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1889929cb4---24755666268.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a45114b26---parasem.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r4405c0tng7dl7mlkfa7c46lmh/xirilipitipe.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/989b480eaf1c1a801f370462412c7392/65098582138.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b68dfe90f920f032179cbefc25e2cd72/78146921906.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609623c7740d9---vosasisa.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/jomifutalepitixor.pdfIn PDF document text
    • http://getem.eu/files/file/35715260979.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kijon.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/rowotigibisanimikog.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcbb702c9---fubugabekisovevopudiraf.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeac78ced---babasukubudekezibafo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40aab481b4---sikafubelopubugopikarunig.pdfIn PDF document text
    • 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_off0001b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B558 19464 bytes
SHA-256: ff47ffd21345058a3b1da32bb4575b2bc4750da048db86cb776a092e15025a68
font_01_sfnt_off0001e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D5 10124 bytes
SHA-256: 9885e346cb90af79c7083aaa2ea8f4cc3bf491bdd88c2e622cb5fbb64357e856
font_02_sfnt_off0001fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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