Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42dae5a062a64a2…

MALICIOUS

PDF

73.4 KB Created: 2021-06-30 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a481fa4e74338bf0849b7d1d7ec4bce SHA-1: 590e2ab3270f73ad00981b7983b28b2226a64d54 SHA-256: a42dae5a062a64a24b44b1df067ecd0ba92e820510dc1c1e7d04ea3b0242e75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9cadd1b68703c5741b6d5abc1e3d68d5/bixukovudumuretilu.pdf
    • https://afayl.com/userfiles/file/49413218859.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c1198489---65279363059.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6f12e75408b36aec2cbc9c7d5e3bfedb/mijexegafoxowakozutixiriv.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e5d306b7c---relekokinixulijizas.pdf
    • https://businessservicesuk.com/userfiles/file/44901730897.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/72926d9d5485bfff3978d3780690767f/2094662462.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/najewivezaxaworu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb9d05ae---85948633527.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fad280ba9ccb1e363449e22a62616845/29293477420.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083a7beed---vumelegulatom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9fd07849c---pomujiparodilopu.pdf
    • https://lasanisports.com/files/44493205340.pdf
    • http://feast.to/upd_file/xatovu.pdf
    • https://foundryindia.org/userfiles/file/74384686203.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0cf0d5c22064d8e40c68c502c93725c7/61723790783.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0bf601d988286444c7138636968542b5/kiwamot.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1175df092ae7ba71b7a0c2013971169b/penudikoloxeziritedifati.pdf
    • http://matsonconstruction.net/userfiles/file/27511512344.pdf
    • http://geodavidepini.it/userfiles/files/vamitasalemirenan.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c5c09e04---86645563742.pdf
    • http://agriturismoilnoceto.com/userfiles/files/kirudojamozagaxijika.pdf
    • http://nexxosrealty.com/userfiles/files/31524838350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+will+always+love+you+diana+ross
    • 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_off0000b9d0.bin
f6f7dd061d3a9b61b891183a14682db6f77be65e6582f6de082cda222d869926
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D0 18948 bytes
font_01_sfnt_off0000e84f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
font_02_sfnt_off00010066.bin
d43e4324962d1706d70212fdbf83f75eac7f6c9d079634f40b5261beaef81b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10460 bytes