Malicious PDF — malware analysis report

Static analysis result for SHA-256 879d5b1e533c53f8…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 19:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 85a5f8c472f4d195c82c802f01a11bca SHA-1: a180dbec3b76ee3c5f07f180fbb5772087c14583 SHA-256: 879d5b1e533c53f88f936f6cfbba6e80876f68c1bd7ee05288bf5579824f2b24
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a collection of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=helicobacter+clo+test PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b0cf3f4aec6754fbacc07352d4b6330b/diruzupifipopojurudikenu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64685a0e4c---lovosadugesisedupukamusam.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/12e0fa815f6fdef64419c2520a67bf1f/juvebikewab.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nifudiduvonuwewakuvibab.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/eb9c3a88f72592710e9e2bdfe47e0058/85987260451.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/19546064703.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/fugiluwomaxopesozi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lonenoz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b905a122efb---4289932950.pdfIn PDF document text
    • https://reniuved.it/file/37095138784.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/db660a785f10be45cfe2f2f8d0cf8fe4/fawezekoxagalofudakaxo.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/50456510416.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee997d45224e52ec9914e6639c1ffebb/venukunafamomidubik.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d66ac62a35---42536620028.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca247dfe8---nixazokiropamowuzifubix.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b865908ad---sofanuguzotevuwowoju.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce033fa78---30557098616.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194b3b8498---31206887272.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c80a46dd4235c78c1c4e6963f373bc26/putudewarimu.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kudumakikajalorutirix.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/22086542961.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e28a61494---xojugap.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/pipik.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5bf53ed2d7cc609b2dc54673173a3250/fubumidebetoruwawixukibo.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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 19224 bytes
SHA-256: f5729289c72dc675389387c497dec408a029677f9c7ccf8468f088908aa5d80d
font_01_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 10248 bytes
SHA-256: 1ebdd98e585f12c1e51a70f0320523175cf484c20de05bcc04127469019cc366
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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