Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fb8c3f32b72438…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 03:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e7cca71506a89fba233c51b275bd1ec SHA-1: 351d50d4d83bb51136f91bfda8003e97e2694dd9 SHA-256: e7fb8c3f32b72438cdc0ad2106a829fd30e59626269382b4884c6b4072ef8f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially harmful content through a link farm.

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 https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1554bbcb442d620c58868b33dee734b5/lorubiviropowewuve.pdf
    • http://zuche0551.com/upload/file/87588252890.pdf
    • http://babywagen24.de/userfiles/file/xajor.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd14b6a62---93481209560.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17b9b1d10---57488953878.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8f854a98---geguzibi.pdf
    • http://www.gonouvellezelande.com/files/dipavaravoxoserijunaxibo.pdf
    • http://bulgankhangai.mn/userfiles/files/pikewaduro.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608841486865c---19073825189.pdf
    • http://arch-teh.com/pic/userfile/gofakurijekizixifufalilin.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a907f6d7f27---89521572526.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89893db3e---99464903223.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pafazivatutenavitewaxapo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ac5e3f1e6975d857030e945e2f1740fb/zagulowipusirura.pdf
    • http://westernmaki.com/uploads/files/52967119834.pdf
    • http://studioriboldi.eu/userfiles/files/98309250221.pdf
    • http://spreewaldatelier.de/img/editor/file/sedemofegavuwaxanokomubaw.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0ea6816228bc5b6420543d768d050afa/sumer.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1edb0ae69cb457331b4b6a553c063099/98737191568.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vtjksdhcm49abfjqsd6od0l1u3/mebobafonokinomeledirivi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e213b46b56---saligadakazaz.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/fijubajofakelozunejimekig.pdf
    • http://www.ez4parcel.net/upfile/files/2021/06/25/rewubebenawerujaborifu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+train+a+cat+to+use+a+litter+tray
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f134.bin
81dc65a884e6aa94659e0f06f5a9ad41120899ca782863c8d278818f6f956f73
pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 16680 bytes
font_01_sfnt_off00011c7f.bin
cc5f2b80ee73588088158e18a887dd3aab859773b3d9ac1302eb9bb48d1c612a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 10516 bytes
font_02_sfnt_off0001349e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 16792 bytes