Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a9882e1b892be4…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82f27ca2bf757851a69b986aca4f5320 SHA-1: 56849b317be015e53bcbe5daa88d62139fdc8252 SHA-256: b4a9882e1b892be41faa44ceaccae1c9597ec75f3ebbbb5d78c5f22854ce6970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crewmak.ru/uplcv?utm_term=subject+verb+agreement+in+tagalog PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776f6a47c7---54525476295.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05162dbe0---rojepizasigitaxobikufaroz.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891d7842ec---dexuxakovelige.pdfIn PDF document text
    • https://andrejc.si/files/file/noposivoz.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/47010487924.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/97c33b41d8fa9d59d705cd0047487ba3/sewalinokefogole.pdfIn PDF document text
    • http://abnicum.com/files/file/67754277739.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82100407724.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/32586547359.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/77c76c3690a48092c0ce974f5d678182/nijevasagadixemoxi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/96okj832al7e2f7eq0vulldt5s/gifawatujineput.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160788bd6ec7a9---julurekasuxilofo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zefolajigefuzezidekodu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/fonefogowo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a328bdeb---71497225440.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p5icuhf9o5lq64lqqkt9dp1lbj/11939698960.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2aa13ecd---30160812391.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ddcd0137c52e00431f2201c00a4a7d8/96756336152.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vhoqo7p6jgpbo36cpnebp7eodb/67937520843.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19160509120.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a55cf125---13292536869.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 17792 bytes
SHA-256: 3b4fec32c409a7215ec5c1a60d0e5b88f4ba064cc56e79306a23a485f520390d
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 10916 bytes
SHA-256: 0d133e7e8b17bd00c55a9351d5cc76037c005f3874362b9face24d38ae836e52
font_03_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742

Open this report in the interactive analyzer, or submit your own file for analysis.