Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5a7d791abb6599…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 06:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c05dd0e4f251940b5186ed51d683a03 SHA-1: 2fa7a12b8659b881a91c1c6783cdf00e9ecf0784 SHA-256: df5a7d791abb6599d5e0b258ffc8e625296cf6464e4a82fdcedef807f05fc299
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common tactic for malware delivery. Numerous URLs are present, many pointing to compromised WordPress sites, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=save+as+pdf+office+2007+plugin+free+download PDF link annotation
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/57036060202.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc27ca66---miruwexodubod.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fa122011f85---lavosozanuwikaxivi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607638dba0807---bekebubiwikivitubidisidi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b606895051---70366336420.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e0bc019384fa18d85ad20bac345f127e/98356043025.pdfIn PDF document text
    • https://ovalpolycoats.com/media/tigizofevetegemotuse.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ad1dc7d2b1646a14dc26171d2d522e2/tawulegexo.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/13756894573.pdfIn PDF document text
    • http://www.moyekolodin.com/files/10614181630.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ed187c417---30179162762.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dcee06fa143056eba3ee9d64149a0802/napifezeteraral.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/96266776031.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/686f4d5290e04fe5589f4fe75ef58498/sesom.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b6fecc3901863a70976123e82fc84f81/viwawuva.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc63cf4b7---jafixamu.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/pomojodimadu.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/99001673470.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/fawim.pdfIn PDF document text
    • http://airfa.it/userfiles/file/19809089039.pdfIn PDF document text
    • http://dogable.de/userfiles/file/27521801948.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/12365266455.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7f9afd824197479e28c5a336665d787a/66175944743.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 11316 bytes
SHA-256: 13f8ac3261ea3ebe53d618d3cf5052fea72b0dd6b7b2a4e52fe03c587f175f43
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 18356 bytes
SHA-256: 5e4adcc5656c172410922464e33b8b49eb227d871ee3e654769ca313ba230796

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