Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5197c83e31e3f8…

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 23:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aa5c2d14b5b393d0a43f48a5b796ffe7 SHA-1: 627c6c0b082c012eef69340da72fae0e0f95a3b2 SHA-256: 8f5197c83e31e3f853f2f1bc7a87ba63a9c093dcff7cf6dc37ee75b3abde7621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea74488e03---nudujowa.pdf In PDF document text
    • https://unique-u.biz/images/uploads/file/79602450228.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/77096873540.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/56634870865.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec6552a85---pigub.pdfIn PDF document text
    • http://markone-tools.com/upload/files/94958574853.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a657308d6---72018202723.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/mimufidukusebagutijija.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb598d81f3---mebilewemobizagafaraxoz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sokokagatufo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/696faf681eeb41ae47db014664de11f9/36887419696.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gibineniv.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/64193805924.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d8f78326---majedesesamadatifa.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607108716e4ae---basigunixudotu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/16586503572.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d006e5f705---5456346870.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13f86b3e8---51287672660.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/98562767482.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vupoxasubatatolat.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/ribunotanu.pdfIn PDF document text
    • http://kibledergisi.net/resimler/files/rafepon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/209e278385bf4df3bfffd5883000934d/wasezugabexir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+just+wanna+be+successfulPDF link annotation
    • 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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10424 bytes
SHA-256: ac80309e9d8f50dd2ddc9051af18497bafad9cf1af37a894cbf015ccc2271c43
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 16916 bytes
SHA-256: a084dcb91b9ec4be01b527acfb3b8b63ccd58e86f4f16cde5fb5c38a5b01de5e
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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