Malicious PDF — malware analysis report

Static analysis result for SHA-256 f407399eb51d4e5a…

MALICIOUS

PDF

96.6 KB Created: 2021-09-07 22:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b695b00988072d8a2b3ccaaf5000e95b SHA-1: ee88f5bb37fd4ceef06983a5392a407c901166c5 SHA-256: f407399eb51d4e5a3ed66bac19372d710fcbefde32acc3abe6922e20f5dc806d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sasalidayanisma.org/uploads/file/nimajimimixutoraja.pdf In PDF document text
    • http://deltastal.ru/userfiles/file/liraniwoletedut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e648447529d---12784062391.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/sarudawiduforinanaxa.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/4090954115.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/xowaketadexelav.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xinofirogigazubisure.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dc268dba9df---35628954213.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/88924577735.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210815160723.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/gexaributijijesotoro.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/xewabepozaxov.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a064e8ac56b---dixesenovunujakavemusi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvr8508gkoifu9dtt3m9fk7305/lewolubodiredaniti.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/fewuluruv.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/xulugeved.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/bavevi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/80846889659.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/13544450823.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/3586835654.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/mupif.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19df3327ff---zanazenosapa.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/77e3fka2mv0uii5s1jttu66p9q/84970464338.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c79267571239a45f1ace9e7670917194/juziziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=makalah+penerapan+nilai+nilai+pancasila+dalam+kehidupan+sehari+hari+pdfPDF 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_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16528 bytes
SHA-256: d5be0530c6a741e013aa604bfa55e9dcd9b87a48472e9a311f18afa3ec48c55e
font_02_sfnt_off00015917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15917 10852 bytes
SHA-256: 24a7624b1c88adc0e9f5b78df3acea4f236fb8431ab08273541904250e858fa5

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