Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a51776c53db067…

MALICIOUS

PDF

107.6 KB Created: 2021-08-15 03:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f15c8f61cdfffcd94718f7db8106aed2 SHA-1: cf8880e84e578746a645a158e1162e22b14318a1 SHA-256: 91a51776c53db067175caf5ff693e2c64efd67ed6b70ea302b4acbbf283f8040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=how+to+draw+a+sniper+gun+easy PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c42afad6ee4d3108c73331d54ba335a0/jidimusaperixeburisev.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf6a3560d---waxuwifuleriwum.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/felijimilijujozujabiga.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ae68d4b531e0c6bf9e0eae9f01261b3/16663486250.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kifujono.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/86965176610.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bibgr9kqj52olecjs5jkd11v1q/86956358230.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c3d21504---fenuwonira.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d3ecc0e71e0a06cba09c49a2de43e356/gekarunazisupamixasutid.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091481d6bb64---15375383360.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/70011020095.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nemotosutoxikavovakuworob.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/lixusak.pdfIn PDF document text
    • https://etadelloro.it/images/file/pidefosazokadub.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/xafedasetetowevi.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vubigugolajelowevumov.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/duxef.pdfIn PDF document text
    • https://asiajitu.com/contents//files/31453512429.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/wevubezejos.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lakobipazenegalaxadawa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec37166176---bolisibi.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74030673732.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/36443578294.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dac35a07ea7---tadozegozedavowajajorobow.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8598622894---56306144645.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_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 10812 bytes
SHA-256: 2b6e223b097aeead0277911e0c166f07b42df62947e90719fe15294d9535ffb1
font_01_sfnt_off0001553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553F 20048 bytes
SHA-256: 2354b65e2fb695ed3177481e954f4766e80822c9a3a49e6edbad7e99b7dfce42
font_02_sfnt_off000188b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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