Malicious PDF — malware analysis report

Static analysis result for SHA-256 195251da278ea898…

MALICIOUS

PDF

70.0 KB Created: 2021-07-25 17:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7f8652fdfd3b737cd07f687fade8bbb SHA-1: de88770bd9e324dd14760f9311cdf7a74a0659d8 SHA-256: 195251da278ea8983ccb0436967e65dc6987d21e3015655359387558bb485776
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mu-rrrc.com/userfiles/file/66253998996.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fd987d21---kivido.pdf
    • http://dydlhx.com/upfiles/file///kedaleku.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0a63a469---nelaxujusoz.pdf
    • https://caribemed.com/userfiles/file/xapewomiz.pdf
    • http://purofirstli.net/userfiles/file/73874208108.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160730f0330818---mavud.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841b45adf5c---naten.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081396b4f743---xojapidesela.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608535aae767a---79934901029.pdf
    • https://uleshuzatabc.hu/files/file/57335392810.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ee9dd650---37897073168.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ac53aefc0757355a1377e5aea31c0ad9/xedowuni.pdf
    • http://rickgrisolia.com/userfiles/files/69571014608.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/tomabitetolofalakamij.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a459f2dc3---zevimufov.pdf
    • https://elearning-chemistry.ro/userfiles/file/63255264092.pdf
    • http://brenno-tojestto.pl/userfiles/file/36860901127.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087504f0e745---gulamepele.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bbec410fd---64941761921.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb00a21ae---11694016906.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/45288929850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=simpsons+tapped+out+free+donuts+hack+no+survey+download
    • 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_off0000b14e.bin
f684fd3422b0b0fb1cfb32f4e3d9122674e7e50cde4e81324cfb3159b4c50130
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14E 15040 bytes
font_01_sfnt_off0000d7bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16792 bytes
font_02_sfnt_off0000efd3.bin
421ee5e24336e8d4a0572d2fe0d3dc9faef93fdfd98dabe0620cfcb1cd1ad89d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11416 bytes