Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ba5236c78345e4…

MALICIOUS

PDF

98.8 KB Created: 2021-08-09 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 533d66c3e37ad86d530549af3c2923a8 SHA-1: 115f420254b77f2798631c772f8213a30564d82f SHA-256: f8ba5236c78345e4eba7202ab72fcc8886696d5f9920423ebc191be4823ba74a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://philabc.ru/uplcv?utm_term=hawkes+learning+systems+beginning+statistics+answer+key
    • http://ndt-tl.ru/upload/file/gutuzazunizoden.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca856b2ed0---jujagumulagowizojaxamiro.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071869f03109---61514264033.pdf
    • http://jdjcnc.com/upfolder/e/files/20210718181231.pdf
    • http://fautographie.org/images/userfiles/files/funezuzodotopirav.pdf
    • http://jyjwqj.com/uploadfile/file///2021072922075958.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d9dc0748e---jenufusenelasumobafivem.pdf
    • http://memphiscentral1969.com/clients/865565/File/jegosigajujaxoremuziwo.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b188fa369f3---kopogago.pdf
    • http://szguilong.com/userfiles/files/66048379570.pdf
    • http://nuraski.pl/wsg/userfiles/35747132650.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924570093fd---wegulamaketokapafuj.pdf
    • http://fairway.cc/images/blog//file/17656633803.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dca81125a---45668444231.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/jekerone.pdf
    • https://a2designbg.com/userfiles/file/nizopufopuviratasufe.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ltjpf8pue6feo436s73jaav2h0/durofojebo.pdf
    • http://asbazainville.org/userfiles/file/rotanofijimimufu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b966fa3af12---motize.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5734926911.pdf
    • https://stdtekstil.com/upload/ckfinder/files/45943495444.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d49e7cb1---49814236729.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a71e77d3273dfc05f493e7f0369290ef/90360706556.pdf
    • https://dentalrud.com/userfiles/file/95785039044.pdf
    • http://whatdwellswithin.com/file/firazumurojulajazixikiwib.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088965e650f2---zuwifexunisoba.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ep5j0366a7gi772qfqb9gg0nn7/74066283488.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_off00011a5f.bin
e8dcad3ac33a4c7d08429cfa639dfe4d86b14e3d95e7de969fb0697be0f515b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 18328 bytes
font_01_sfnt_off00014a3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 16792 bytes
font_02_sfnt_off00016255.bin
94e1bcb6ae23a5c142429528ec2558815bbcfa6bce2f01584aadd5c817fee987
pdf-font-stream PDF embedded font (sfnt) at offset 0x16255 10876 bytes