Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8da3c75cf89e1e8…

MALICIOUS

PDF

99.6 KB Created: 2021-08-08 13:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0550c932d39d3b09d5d3c286630a45f7 SHA-1: c116ec67fa1af4db4469b1c81e46398d5e33590f SHA-256: f8da3c75cf89e1e8537f5352ec59fed22c72d8389aebace10cb4a4f8fe5a2cdc
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a coordinated effort to host malicious content on various compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://atek-ent.com/upload/file/zatuvuf.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/81221189534.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/77321771804.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kajujusazusavejowine.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nofubinizumulikajateru.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e7e70e30---nezofulazusatu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2cf9522b---54121990772.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1a67082---93782594839.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/72847871570.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/39369708604.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210802063045064.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ca61f7246bd08243e41bb2f0e07337fb/70345357235.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16101097ba649a---83652665267.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4r73bilj29u9r3012i537u9696/wunafeduxurevofofateb.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/10204605163.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/63797008131.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3o9e4mj161f37k2das863u061k/titixab.pdfIn PDF document text
    • https://kristinanamaste.eu/files/41851460588.pdfIn PDF document text
    • https://wagaskar.com/media/kutudosapudaxemimesu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b29709ed9ae---65417463752.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7d6f16c4ca20405a988cbf17f0cd1ff4/bifajida.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c16432721---tijexogif.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/28799991218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=strongest+dinosaur+in+ark+survival+evolvedPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16288 bytes
SHA-256: 47701b8b47c77a0cf28aefe4b4308fedd425eff3654fefb6465933fee19e5195
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 17224 bytes
SHA-256: 2052b00a909039a0adacb6e6a9c9be975007d3146038326239a796422b9cf957
font_02_sfnt_off00014f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2B 10756 bytes
SHA-256: f0b7c9653ec1efb1b2d3cc58bd9c56c15ca38032082ae75f7aab10e50466ca6d
font_03_sfnt_off000167d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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