Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f8e6172485bcfa…

MALICIOUS

PDF

156.3 KB Created: 2021-07-14 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c97152e006b523ee7d5bb4df3c7e0f6 SHA-1: 2296e1a6d665b577093daecb0ecc9517bef31108 SHA-256: 65f8e6172485bcfa20df5fb93f44de0f0e643a7759bf5c3707470d767e4aa1a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=solid+state+electronic+devices+streetman+7th+edition+solutions+pdf PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d8e9e053b5d2acdffcc8a9643253582a/pikatid.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/podabumuwaxukowiwunuzebet.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552ad49234---58433336636.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/15230806008.pdfIn PDF document text
    • https://mfdesign.hu/files/file/74097138522.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca067e647---67648134379.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/97126420084.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076be6b4e286---49784734811.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/91950796633.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a84f7ab152---57280777623.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/79863988631.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/5caf2365cf9d73525bd54797a3e32db1/11144898277.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4087826286.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/ruzusifugi.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/reterane.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a3621a4b---57860240408.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/poop7k2s4sucbsdh70e5fjlin2/54723995632.pdfIn PDF document text
    • https://soechi.id/userfiles/file/tanezor.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9c61b44fad25c885eccb7931ebf565f4/90398705140.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2d61f9a2---29979708121.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210522220258199.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0il3ta35pf95h15f663k84fmlb/1599924164.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79f0ac087---veborerunilipu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kewirenepafetegitug.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_off0001f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6FF 21236 bytes
SHA-256: a38ba2be1833a8919bb948603add2f116b3a840edb39441c8171a6d595e42154
font_01_sfnt_off0002309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000248b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248B5 11176 bytes
SHA-256: 3ca4e0b8be43e5434b29fdd76d7609832485026ef7f61863d3952562c773616a

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