Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f61526a617f94d…

MALICIOUS

PDF

100.4 KB Created: 2021-09-03 00:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cca6fe9f06c8456b2dd7be6a6f5ec0d SHA-1: 087340f893b0822af6283291e9c7391a780a2c7e SHA-256: 37f61526a617f94d3720e5b9fe04ec3ccc025c924dc68223ac04951ed5fae309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=retrospectiva+significado+pdf PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae05864f0---nebizemaxuneweneroma.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210730002854.pdfIn PDF document text
    • http://zerosquareonline.com/file/raxiligudopatopid.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e321b120ddc---96657634772.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/46641987356.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161257feba0f95---27746034634.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e289f6c2---fojuluxeru.pdfIn PDF document text
    • http://klinok-saintp.ru/files/7426914310.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/tugojok.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/83813211509.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c22097ac---65050226828.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/6966633312.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nq6mo37kvpcsfsku3sfbpc9hmc/zejipazovog.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/xelitupikud.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/motetapesuwolude.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823e98ce7b1---lawurelupemaduzawinafalus.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b248f69e3358cab12a23ed1de3dc6dd7/37281809628.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd57162d6a---filexidabuxinibawidubo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/deff317b1314b2900c301f89a6a28dff/suxolugixozap.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/dabirufo.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kujigarolixu.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/8c15e5d10da88181bb529fb164ee7e88/kikijavuwase.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee84294cdb---sefudoxedobajizemew.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_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10860 bytes
SHA-256: 33dc6ba3a528d5e7050f85f0cd39949889fcdee85e1278f4b9c1d81fe78e4e4b
font_01_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 20896 bytes
SHA-256: 1f3c748af24b9d55ee0ed99c6977144f7e110c97db1b6a15e009216bc08a0b9f
font_02_sfnt_off00016bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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