Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c9714da91c60eb…

MALICIOUS

PDF

84.9 KB Created: 2021-08-24 08:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92fddc6b44dc02532004950da84bba3c SHA-1: 081d9bfc7a1dfd1e1fb455195145fe381ad8b85c SHA-256: 42c9714da91c60eb20716ae1de1027cd7b2bba8b011069b3c185e6d46d53f1d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lubrifianti-auto.ro/files/file/38209431115.pdf In PDF document text
    • http://toshiba-center.ru/uploads/files/rotemokitevulimifovina.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b3d650f156af41d27e4a46318abb3a35/21783455463.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4vkcoioedbmpjcetmnf63u9i16/nawitunomuguzan.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee33349b20---69192076069.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6444287179---38984357445.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/55296987272.pdfIn PDF document text
    • https://lecachet.fr/docs/files/vonenenojujemelujo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r2fo1s74cgoa65bn2c6g1alb7t/foborebomipive.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8338ae7d7---vafur.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/bulasajowafukuw.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sajuvi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d31b057a6fa66f38ad06be6e1b9a2fff/89883978866.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210707212128_194551764.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/24166066066.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lurizaki.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/70505431751.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/nejulevebewoxel.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/23476003217.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zobamewomasuvukakaj.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd26ba6c3---59253578789.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/wojemimi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e7924330b94b48448492ce05c0459525/durijopoxulokuzezaxazep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dog+lifting+front+pawPDF 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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10320 bytes
SHA-256: 353990b7beee3eccbf502f10670a05f0c6b258b7971b91b384a08b6deb722304
font_02_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 16892 bytes
SHA-256: 3c23294ee0b3b9eb1167e74599c1418164e11930f476ddc5db6507750510c9b8

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