Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b48cecf5400ca3e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 20:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88447d7b048ca400f7d9692e3ba58909 SHA-1: 3518c4921d3ae8774f2e369b36ad8f0d9f7d261e SHA-256: 5b48cecf5400ca3ef2ffb0332a7d37888d3bf813c0e299eb932251b4434f3b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links to potentially malicious sites indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://alothongtin.com/upload/FCK/file/puvowewolugifaxuvod.pdf In PDF document text
    • https://stallion-international.com/userfiles/file/zeperelesoluxu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/75725042229.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfab5cc7d7---legovoxogefolerezodobuw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tejefatavesodemexirewuj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd17e82ea3---tavabapipufep.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vamawujamogumose.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b60069b6c---tamesovavupowugodaseputul.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160100356e6---49619071727.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e473bcaf3---ralesarivofinezasasu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/faxifefunuwadigitila.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/h7pgvt24a9449mhmmp1hv6s6ee/20734887274.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5b999a077c9048d91b170b69097101dd/76375133141.pdfIn PDF document text
    • http://imaginove.eu/data/Files/56984291293.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/22803272960.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/65853667827.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/29012004821.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/fuvefekimogosawet.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/lofabuvigeg.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a757f42a3a4---latilubebiwazajev.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074713e71ee4---vibopusabodapasalevuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=worksheet+generator+5PDF 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16492 bytes
SHA-256: 3736f2c6229f4682c793036536422f69a2e314fa419a5aceecae242bf24b0e38
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10468 bytes
SHA-256: f4120b68943fd5dffce742d666ad69d049003790379977a89b4c879b46800eba

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