Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f89d3f54361405c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 06:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 016380614472d742e9a7ceed9f61549f SHA-1: 0a2b96c3469710a3b8b0311bebf17a87bce2ca77 SHA-256: 6f89d3f54361405cd1afe0b5fd63e448c23fa9b074e2380bee6b8dba1ff0a587
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. One prominent URL, 'https://irlanc.ru/uplcv?utm_term=god+of+war+3+android+apk+download', suggests a lure for downloading an Android APK, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://irlanc.ru/uplcv?utm_term=god+of+war+3+android+apk+download PDF link annotation
    • https://fulzugaskozpont.hu/files/63504434862.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/muzowibakirozekiteke.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f66c7511---matalutemikikuw.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/14910123885.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/81731204649.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/norigiwonigerusadotumom.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42921180292.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84253507118.pdfIn PDF document text
    • http://spakimthi.com/upload/files/52337650189.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/95846079610.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fexovuroveribidomisukeri.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nadujopebevaj.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/vezegununirebavidexox.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wezavadipevulozok.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ravawugimagulaji.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131a43f7e249---46717952886.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210909103829.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89804705852.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/12086578718.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330e0796c76---xejij.pdfIn PDF document text
    • http://brenderup.ro/mm/file/12197774484.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36112759078.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/gogazibimijaziwurifalar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e797.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE797 18420 bytes
SHA-256: 86214d52a0a6395a5cc89f69dc884857f939bfd95818bfa317b410757707785b
font_00_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 20004 bytes
SHA-256: 1a679e0e479333b307f70a8182def9f3d84f7816aee40658d72476ddc19fd93c
font_03_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 10480 bytes
SHA-256: 1c90e7d0c7a51526af0014716484f83db52b95643898cf81a1d0a86586cd59cd

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