Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22e4643bb9f7124…

MALICIOUS

PDF

78.2 KB Created: 2021-09-24 09:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a53c97ba334d73a76df229c747d8ac9 SHA-1: da1771a18807bbd384ab9a6224c627275bcff743 SHA-256: e22e4643bb9f7124229b5a20e072d3996e85dd6d6ecedc9ab688fb38c8b50250
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, some pointing to compromised WordPress sites, and a heuristic indicates a visual download button lure. The presence of multiple external URIs and a link farm suggests an attempt to redirect the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zaiger.ru/img/file/fokuxukefizebup.pdf In PDF document text
    • https://limsurempat.com/contents/files/biwedagenojow.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/11644815670.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379158d1ef0---ridopuso.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3a8d94a62a8f0acc95e062b29ce9a5ea/50540009538.pdfIn PDF document text
    • http://parateam.cz/file/zabakugoboneromukute.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/tuzapa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/naviruzeriwad.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/jirelogumojorefadawivuv.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/3934813358.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fb045282---25029318244.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/78501716491.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/wuluwuwopup.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/91176887257.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/fovawavanubu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/fopoboxax.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210914161851.pdfIn PDF document text
    • http://zuche0551.com/upload/file/3342780528.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mimipopajivitubapajisebus.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/87311994652.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/49444502692.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2971300b534d998fb19f0bdeb7cfa110/tiniwenuwa.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vumabuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+v+download+apk+full+versionPDF 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_off0000c657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 10872 bytes
SHA-256: da5db295f2cca95354cc2872ff8839626144a56f2a0e8050e302be748a73cdec
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 19740 bytes
SHA-256: fb26fc00cfb759d2c8e6d5b31ab26262aa2d103fa8c71852beaef300adb2fd7c

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