Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ac132f23667254…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 10:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a707f66e9e46d801a7f8b0bbcfeae97 SHA-1: e16d495cb2510be23a20dc3d3f1ed6ca9636bbe4 SHA-256: 95ac132f23667254b22c88ace3cb3e5482764accf1c3f8fa7887d251a562d1e6
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malicious content. The presence of external URI heuristics and link farm detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=oxandrolona+efeitos+colaterais+pdf PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/58f8dff268d07026e1e50b7217614f42/faguzarilojifosodi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/35c9192a35e5f5ce373a89c569f36ca8/fuduxevarewutinasadugi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d348e5e331---82006931129.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ptmcm22ea8j6v8f00nm66co21h/89356622375.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/69108510399.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b078c8d59---tadatimesefezugeroxa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609795a32a4de---wavojamexidi.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/67155647590.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16106ba7d60636---67492059405.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/vunusedek.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273f0065280---67366788056.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0e984b38d7ccf25891b1e3db224b5b82/nosavijovasod.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/pogovavapegima.pdfIn PDF document text
    • http://agro-partner.com/Image/files/zotopebegimegolofajud.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/51ed311aab8ef0637e2ad9313f1286a1/52600798030.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/famuwijuzatipotodejomorur.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/abc4a47787d39b4527f21ab5c96dc3ae/zejajunelokazeg.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jafuluxur.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/0i31l6ujj5f04jb5fp9g2ain57/jazikok.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6797ae75b3---zobameraruwu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210722102457_np0wfi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766197dc90---jeluwedakavamiludokikis.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xotikipezinojubovu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 15444 bytes
SHA-256: dd7a4be135b46aa82d0ec7237d9432aea2f4401781fce4657c4cb78b9a5a4b70
font_01_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10740 bytes
SHA-256: 070d7762379a24245e60de6635b90a2b52404e531ce26664c40538ae638aedb7
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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