Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c39f8d2a0366a0d…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 21:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4bedca48d8ac5c4b3f29d5ea20ffaca SHA-1: c3f16281bcbc9a41b063f4dc6f87131c4f1516bf SHA-256: 1c39f8d2a0366a0d874fa659a054f77d3f8ba5a64cdfc5ae1d2002259e9e0588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many pointing to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://riskhedgetech.com/uploaded/file/191762326560f126a87644b.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/oiut6cpenob7qj5cqbj9p0pv1j/56860897578.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0f230b8c14dc30e42f0d434d77e52b43/kutisutetutovekimefekuk.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8hcf0ktiiailjc6t9hu2sdc71v/lixaronipotasemokatux.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f6c8394bd158c7120d344bba1022827/kilopejugokunisoziw.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bifexabuxaradurejujabe.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/70246386936.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/63498839472.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/29456268552.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160765c024b8a5---57478311224.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/t837g10n6sb148ntrprgcn4hq0/gezero.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f175692546d2c7f34ef8bf35324d67cc/52675615386.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/5904865958.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/28588560616.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd47ef608---80457305315.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/82156914001.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6566eea3888c3ac5876ddeb3a12e501e/mebiwi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774feb63882---pebumevobibotutila.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/97405860271.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/fikote.pdfIn PDF document text
    • http://akssert.com/userfiles/files/84177058243.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/52344072027.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/83618481607.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/18370803486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kms+activator+free+download+for+windows+10PDF 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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16176 bytes
SHA-256: a44a5f5ecbee828e93e657a7de7156e0b1c10325858511dde3e6d1d4d73099cc
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 10956 bytes
SHA-256: 216cfa8d6f60763bb22a3385025f85cf8600560745d5ffb8a9aef822d0401120

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