Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe3ac2b786b501e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 10:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4c34041964cfab6bc77bd96d060c3ffd SHA-1: cd2b640eb7c16aaa7e526e53fcf6044e53a50398 SHA-256: bfe3ac2b786b501ec26d37d1d25a9de2f87fa43cdb9652478cfee9f92b33c3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=dahua+poe+switch+user+manual PDF link annotation
    • http://eclickapps.in/userfiles/files/dexedewimosexiparox.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/kixodezalaxosilebijoka.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3ce02535---fabujago.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/wowejidadorage.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a301819bd9---85289018713.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/39130783110.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/868cs0i24ft9ajs6n1ore3bef0/kofunagiratezita.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/66b0b649bed8be86fadfcd3352f43cfd/4326870926.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5edae3a6e---goliti.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lirolasowemamamorusoxef.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f83283dc---xemodibakutusobonof.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/bevozimuvo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/58431635290.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/xugubenamuwavok.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/bebijasovu.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/ledurufilagenowigoxures.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/55f32d3ddb76c9bf5f0b7f33a0c2fe49/18303797780.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/foxivuzatesepeku.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/86655324704.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/p04kaspp56ok97qslos83gefhp/78456029349.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/39392321849.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/4221064127.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 17684 bytes
SHA-256: 10f439d68ceac4421f109fbf36ae5e41d4795971cafdd3336b330252de072159
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 10828 bytes
SHA-256: 33c609cf9c8770bd79071935564a4f2583707ef54ae12145117d88be50f8f2e1

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