Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8087c49f5e45a6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 09:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9baa79a167ee8d1e211b5cfbfcd55efd SHA-1: 855e9e1648b531ad2b543564b759be37b6921d8a SHA-256: af8087c49f5e45a6f2fcb874fdaeeb80a088fc46ecc502dd6c60ba6435eb68c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://7166867.ru/ckfinder/userfiles/files/rikiwoginutasixe.pdf In PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/8280061134.pdfIn PDF document text
    • https://sainaudit.mn/File/16747728255.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/neragatisiza.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/32983850743.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/wonofirotufezakit.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/28651841398.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907094540.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/11504260457.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/fifadunijupokalaxit.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/73865834580.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fefe5fd98---86768456267.pdfIn PDF document text
    • http://zenkatsu.dk/files/50870888403.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/18574227891.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/21ffd1091f15dbc7d54d8ccfcef7b98f/52411822062.pdfIn PDF document text
    • http://stattus.com/assets/file/tetodin.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/45478750792.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/99479303896.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9d19b4c6---kufaxipamojizijofo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d6278d21---babadakezefog.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wawetaxoti.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/sopabolubutawag.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/gisozibaputimebivagi.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/tuwabogomopewumevirosej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=123+prabhu+deva+movie+downloadPDF 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_off0000baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF8 11032 bytes
SHA-256: 960ecba0bb161598f57f850531741838a7e531a8c4a9938185c4a857b5219c21
font_01_sfnt_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 17428 bytes
SHA-256: cd00b1ddb7b7f1eaedec4913c5d3f69d451e505c34c40df9fa8f3cbc6095f304
font_02_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1