Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a80341ef822c68…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 02:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c66a3afe142d052408d29bc8b22dda4 SHA-1: 1fd9a659fc507586d6e385ce55a1c473f1bd3f61 SHA-256: c9a80341ef822c688cf4813221fe27fa2e701dac929c1f0c82fac113c5960940
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit user trust or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=how+to+change+date+and+time+on+android+phone PDF link annotation
    • http://emilygrilltogo.com/uploads/files/91258249716.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/89699726470.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9ee9dd874f1796eac12fd47bad49af0b/kagufabutoledepakobofojo.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/76232915803.pdfIn PDF document text
    • http://imoroz.by/upload/file/74528104702.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/wezoxivokanupekonow.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/33295465753.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jijelosizunositosaboxolu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zekilinuxenimepu.pdfIn PDF document text
    • http://samtekelektrik.com/files/36185535489.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pebudu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1fa682fe---12401207123.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadiv.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wiguzetivevipulabiwakig.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934a2e1e4d---wejovamalafaxok.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/39308918622.pdfIn PDF document text
    • https://isleo.com/i_photos/file/jesekimukedo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kenujanuzekozilerofenug.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5877a468---jigegijomobuzero.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/5622661837.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zuwava.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/83677789645.pdfIn PDF document text
    • http://xfswchem.com/upload/files/26942261323.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/38032830571.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 10824 bytes
SHA-256: 07fb60212d1972ad34d2b1ecadb7b32ee34bdd749dabb18d10d6d5bdb5ba090b
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 18448 bytes
SHA-256: 37f1ed57cae0744e3e3c3d822966f090f778111f26a915397e1f6cc37a1f9216

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