Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cd4889c6453000…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 22:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1bdc78d4b23d1fafd40f23b5d8d8050 SHA-1: 681c320e2ea098c259c2298957d2f52d02163b19 SHA-256: 05cd4889c6453000a6055475e58965824e264fe0ed5ba286455cdfa7773ec7c5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cyuanmei.com/userfiles/file/80192706254.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb316d0c9---54218566162.pdf
    • https://a2designbg.com/userfiles/file/mesadejuduvebofotaxukuguk.pdf
    • http://abogarestudio.com/userfiles/file/17771170383.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8d4953900c11f3314dee9562f3858394/nabibigib.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b618b96d9b43e672800ab0968f88b533/fafagazexozipoxowudije.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4934e953---nilera.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ed1852da1b3070da6c25a9885ce9b8e/32908406334.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b70db2df3eb0fb7787688bcf70513d24/49264914041.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/t0pfbb2eqfpudbtbaob502d0j9/14981623996.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7ac0d958486a14dbea9c7e56b4d1d370/42587876439.pdf
    • http://rc-modeller.se/images/file///pudumugazegoxuku.pdf
    • http://jgbt.us/pds/userfiles/files/95322506503.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59ac63289---57404488359.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc97ee1110---14590263961.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/91153331207.pdf
    • http://thibangoto.com/app/webroot/uploads/files/simik.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nokabovutokabivofemezima.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/59047202459.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/tegerusetexavadisefuziw.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/93c4ab40018a0b56d62254e51ecedecc/41880242627.pdf
    • https://anjingliar.com/contents//files/fisunevufevefafezib.pdf
    • http://villalapinetafavignana.it/userfiles/files/52705252294.pdf
    • https://aimara-bg.com/userfiles/file/13691379416.pdf
    • https://agatanorek.com/files/file/24025369479.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spirit+airlines+flight+attendant+assessment+test+answers
    • 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_off0001007f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
font_01_sfnt_off00011891.bin
435789e949560fb6d983545d44e35b67decda384a5a63884587c2beb1cc9ad38
pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 17304 bytes
font_02_sfnt_off0001456a.bin
2f6c0474e6ba60a1d16ada6f0d309cce2e3457075405b9556f257e338caa4c83
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 10988 bytes