Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7520dc7038b3cb0…

MALICIOUS

PDF

96.0 KB Created: 2021-09-08 00:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a62a6b2b3875741b4463c59b4da0eee5 SHA-1: aafc5c1e2cdbe88dfb74d99b6eb85848a5c40962 SHA-256: b7520dc7038b3cb0b5622c5e0b23dfec4293a1af4042239abb55f2d873f7df51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=cricut+explore+air+2+design+space+manual PDF link annotation
    • http://dogable.de/userfiles/file/bonibexerumegirazalixe.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/83925036141.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e3abdc31---97712524251.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d0461f410---16213666984.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/litemebapexematixezalos.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160859f4b8231b---loputibanuv.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/85923350578.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9038234c---39632173147.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec1d87834---tapobuvopolo.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/68079452152.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/57108689635.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/lanazow.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/afab352088fd7bcec6ca1dfeb47c571c/29735340400.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/75488905459.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989efbb2eeb---25572539504.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10f7a13e0---genazabemafabasejosaraj.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9b7dd32693db2606de84b54e1da0556d/sinawalapubiligado.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ruvuwegositas.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/3283395084.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/94710898571.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/nuxezolabedusufuxazolu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee395042f2---gelapisoxeso.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/kiribebibaxaramamala.pdfIn PDF document text
    • http://protok.pro/upload/files/26592002964.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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11212 bytes
SHA-256: 4c495b3c834c108e221adf218f6c2d840a5b76651306b63790bad3ded3e87cc9
font_01_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7B 19428 bytes
SHA-256: 77b9065c49c8c474d1a598513f48931a2bea0648a08b6409a1520b34e1872ab0

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