Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aaf34338dfc7ef…

MALICIOUS

PDF

89.6 KB Created: 2021-07-23 22:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc5cd73f0b5008d8fc361e0bdf0ad2d3 SHA-1: f8ecc4324b2534bc545750071b71c96dd4244ecd SHA-256: f0aaf34338dfc7effc630f4aa90aa72e9f3c316326050fb3c2e031e770dc3ba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mariellatriolo.it/public/file/sizazenesomup.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/92779551754.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/97400500355.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/40i2nfgjf6m0ks4ne7b7gjjftl/16180598243.pdfIn PDF document text
    • http://artside.org/data/temp/file/95410690202.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/40124633733.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/34588105057.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628f9a7da3---99202313537.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/01834ac0290655e5c3f385efc0b6ea52/sazifekanex.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/moxofugimidazodu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f540gvshm5o175av3b1t7idif1/69470102891.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/baxog.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60581d75c---vipalidagijeg.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9804be3bd1---44014721820.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fed08b612d09d53d55727780fc3ae588/vegokefesale.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c596e0a6---73908847786.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/11181126308.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kinegol.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d365600---wadadupasixura.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160707f46cb650---mutokuro.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/gugudoselaputetonus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kuran+harflerinin+harekeli+okunu%C5%9Flar%C4%B1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 19412 bytes
SHA-256: cb7db897e54a739e2390adf1aba97c249a891860e65eef09988ce9b8dd5d7c05
font_02_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 10516 bytes
SHA-256: f3ba0dd3a6293441e045060d8d4a0434b512b823d48627b95cfe2c42bb9e4d7e
font_03_sfnt_off00013fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA6 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db

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