Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b6da131b190426…

MALICIOUS

PDF

80.1 KB Created: 2021-07-04 18:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8f107605d6f97a2bb6e6541d10541c0 SHA-1: 38f1dd7748ac0a4c4e0a29b3dbe83bd88d48d9a0 SHA-256: b5b6da131b1904269d086b962b91223552bda61f8b40dee52bd3ed6727aa35b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into visiting compromised sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=mathematics+in+games+sports+and+gambling+pdf
    • https://burgaseguros.com/userfiles/file/rikutorakafinugadeled.pdf
    • http://studiotecnicomartani.eu/userfiles/files/43587674622.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fe17a02b01077f9824f8f27cb3ccc176/56666173603.pdf
    • http://megat.pl/uploaded/fck_files/file/65443873896.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/97gg6pbc9d8rpg4si9ee4j8hq0/vobobe.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd8473eb1327688a9285d37080e2ac90/revevuzewawebugana.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9aac2e2a---56246774527.pdf
    • https://stallion-international.com/userfiles/file/duluxegusigejok.pdf
    • http://alimentosldm.com/userfiles/file/tusijalu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/57f0623911b724bf1825a697a37bd99a/48429942638.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300f24bf08---36816618140.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c069e175db9eb00ce3dcf994ddbc5600/sijepuvekusuxez.pdf
    • https://tiguan-wiki.ru/file/zalulorezexagitirof.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6d35e34b9---35638709973.pdf
    • https://dacola.com/upload/files/83927580478.pdf
    • http://alnoorcity.com/userfiles/file/92255771232.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d609bfc89---vabutolilezeseligopuz.pdf
    • https://x-software.cz/data/file/82333322198.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7adae1dc6---wozujokudu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a3a2d921966c335dc242f9f6e7140f6a/6513760225.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083f06ecca2f---fitasuxawamig.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/16870906495.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e956f456197195fce497311660d8284c/wefazazufajazegukozuso.pdf
    • http://duszek-lasu.pl/userfiles/file/lajakibiwefal.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/76b208aa4db91550441759a8c1a7fea8/41340461204.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2fe1b2cf58f52d0e35337f14fb38501f/bubogulozerusudesenuviwom.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_off0000d2e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
font_01_sfnt_off0000eaf4.bin
79d0d60e56ef77a1ad4d49d75e0d1830d8f44d9bac6c3f0dd57038d7854395b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 17680 bytes
font_02_sfnt_off0001191e.bin
e301d7dfc2bf13a342cfa16e3474deca67c989b44c0b678f1aef6daac0583b16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 11200 bytes