Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df6823ff2d9999a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 09:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89615ecb93bc621d27fa432f39aa5d24 SHA-1: 23d5062b0de0dd3e38e24e10b8d7b360e8fa656c SHA-256: 1df6823ff2d9999ab5e22ccc38a29a276dd3c2b55e655e272f4c27630bba56f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=cast+to+my+phone
    • https://undergroundtakeout.com/userfiles/file/83638375701.pdf
    • http://telesson.net/_UploadFile/Images/file/41783657699.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/72290350456.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_2D3F3DB9ADBC038E.pdf
    • http://fsf-vastroad.com/userfiles/file/58935002821.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd9174150---95095794734.pdf
    • https://bostaninsaat.com/image/files/lexoxetugu.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4c20jun3286i065kclp1qqrdt4/87460381707.pdf
    • http://radissonhoteltraining.com/userfiles/file/medavipimup.pdf
    • http://123podkrovie.sk/editor_uploads/files/45244999467.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/eafc975f9adedde8d99a27f12d641d78/guzugutogewonefoz.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/waxaguzuruwusarimusav.pdf
    • https://nutricount.cz/UserFiles/File/xepukitepoganog.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/tapal.pdf
    • http://kursadowicz.pl/Upload/file/vojatuxasotutamutigux.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/52974694728.pdf
    • http://zzfcw.com/file/fkimg/file/13963774875.pdf
    • http://sjar-tech.com/uploadfile/file///2021091115113012.pdf
    • http://leprofit.ee/cmsfile/contentfiles/ginudenufiluwibuparuger.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/vusijoxekivuji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db55.bin
48358a94b6d4e591b863e687b843e38ab5a396decbc081b29bbba78544cf4509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10424 bytes
font_01_sfnt_off0000f2d6.bin
c6ea7e78785a977373a770d372f015116591269bc0f2570266b5ca44ce03bf68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 18532 bytes
font_02_sfnt_off0001229b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes

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