Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1774dc52cffba3…

MALICIOUS

PDF

106.8 KB Created: 2021-06-26 06:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a95416bab9446393f08be81ac2a42c SHA-1: 9c505bf7fcefe53525194af6bbe358a3fdefdcdc SHA-256: 3d1774dc52cffba3e500f5b43e29bdb5f97e8f05be664327c3bd7913b8bce683
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 https://cructi.ru/uplcv?utm_term=dividend+discount+model+valuation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/erjmnu51sc4kbb21paikhrd6fb/kokasemenuliwepal.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/talido.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7f81da38ab625805ddeae3233a900113/sufudexewimunaxafozo.pdf
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/zutemaperu.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/798e632ebbb556f86c1ac202f8119888/vededine.pdf
    • http://kaithompson.com/userfiles/file/36909133911.pdf
    • http://emailreceptionist.net/userfiles/file/32391218316.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8f0480eb182afec10d231ddd6cb944dd/68260280611.pdf
    • http://doktor-okonski.pl/uploadimg/file/22651528805.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/765uediuepj5jnv4u4rdbirhed/bebavuvo.pdf
    • https://almuhja.net/ckfinder/userfiles/files/26372350195.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e6ee39326a0ede2e04560bc37e640b6c/68489012602.pdf
    • http://humanitool.ru/userfiles/file/62613222768.pdf
    • http://feach.ie/images/uploads/file/jafukado.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cbebb71d---9389958115.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0306c26425---medezopebixesegade.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/mazugefojutezok.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080883b9b48a---lakupuvepu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29ee80c33---fesesejifus.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfaa94276---277100129.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcdd0d675---17180846364.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9bf289dc8---75814248626.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/79515075723.pdf
    • 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_off00013d8b.bin
321da7f58159a6a779c7e8453e1c87a6d5e9e536009dd2cef09657782bd0bdd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 18028 bytes
font_01_sfnt_off00016da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA4 16792 bytes
font_02_sfnt_off000185bb.bin
84b4e64baf522e4be79ce4f6af2918aedd4fed2d19e04570262571444aeaf8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x185BB 10600 bytes