Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e9057fc875e838…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 10:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d82056aa8b680f104ceb1d9e5b4a9c45 SHA-1: 93b2dd244c2e9859ed44f731c357701331b5926b SHA-256: 36e9057fc875e8387d51b9b193245540c23603929214b04573b7d929fb728217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=road+traffic+act+2002
    • http://asja-doll.ru/userfiles/file/94212392360.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/04cd68302406331339556d579ddf97eb/34141044823.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/dfb0dc446373b4b149df5e219ef30fc7/67995199828.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/digifonamokudug.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc49bbb16c0---27973405504.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53e24299---99872130758.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b7cd14eda1544720ff005f6cd65fd44/naxeridataso.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876854ba0d0---juzalibafepow.pdf
    • http://ptairsupply.com/userfiles/file/88647605249.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/aaf17bfd3eb94cbbfd8ee99efcf19c1d/walodepisedusobiza.pdf
    • http://tsg-edinstvo.ru/userfiles/file/13682747854.pdf
    • http://csc0311.com/userfiles/file/20210615233233_y8rdtt.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde7420029---24239896031.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ruhgve77r1l3u59ql774iigch3/dekolosanoxalitipive.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7071a34c87db3b0a844d55a3d4291ac0/pamafopokov.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803185a2d24---nofegoperewipiludoj.pdf
    • http://ksnjl.com/userfiles/files/wujebogiduve.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/totitoxumiriv.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/52841739056.pdf
    • http://holzbau-napetschnig.at/24367754410.pdf
    • http://sxhk365.com/uploads/file///lefidetepeju.pdf
    • http://abpaluso.com/upload/file/gafawubikepafiru.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96d8ae2f5d0ccb3992b1e44e81101ace/mubezusafexaxedebex.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dta9d4ph5oaqcjcmv740d4fdqc/15374987276.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_off0000fdd9.bin
8d69bcccbe5bc3aea72e6e84a10b8c5515c13bff0762137d49a2bba1fb93b381
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 10304 bytes
font_01_sfnt_off0001153c.bin
9e7e83be2eb78672355b0961ec5e515de91c52e8073467ebcc978d5e619b2c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16592 bytes
font_02_sfnt_off00014057.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16792 bytes