Malicious PDF — malware analysis report

Static analysis result for SHA-256 4646822d6189ae69…

MALICIOUS

PDF

92.2 KB Created: 2021-08-03 12:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2155066a716478122e58f52a61c50a88 SHA-1: 1fb849dc0569757b55b70b87971231039ec8c227 SHA-256: 4646822d6189ae69e89e8952912887647b4eab0a93a5f6ffbaa6f843c456afa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/uplcv?utm_term=traductor+ingles+espa%C3%B1ol+terminos+medicos+gratis PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609590652138f---38074805695.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/16158967723.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/0mbaopt96s729gp75912lm3j8i/38335240560.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42c51f0e5c21b51bb9e9760687b19b82/56650888172.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ba80a4480d67901b28607198a63648c8/xexapuwawab.pdfIn PDF document text
    • http://envigest.cz/upload/file/10768587907.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb3e7827df---zumuv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4a392ee7594825c04f4b9532a7c04e76/kotomazexoga.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/32805196ddc9619dfb26aefe08cd184a/jewemijekejenot.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bffb7288a936c5c175ce3709c3ac9b43/lixoviviruxipoxuwowa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2041b016f7b260bd1f0eadd152618b2b/jatulogezovusupusasoli.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/38e6fee28a2defa9c9f16d3dea68a24e/45579736950.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/42548721058.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6902e7a7b81bbf5b7453dfd5107d12c7/70151859133.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6f0d6b3c---porovavuw.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048a0dd9337---tazeg.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7db492c6---gofenakoduxamizajagi.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zafowofawifinolepetif.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8138b465b3---nivimotagevu.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/wamajevozovaloz.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/xibovutefuti.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/84309372631.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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 19428 bytes
SHA-256: 55763d61ef37939ff8af587f2f148c640eb49309e11ece31f5220d8bbcff68cd
font_01_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 11124 bytes
SHA-256: 6b2c388ad6fee19dfb471da505c760c46724e556bf547e3b8f6d4c0e14e1a0d8
font_02_sfnt_off000147c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1