Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddabe3938727a70…

MALICIOUS

PDF

97.0 KB Created: 2021-07-01 23:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90172109fc9461825880b3880647ca07 SHA-1: d6c8f581ded3bd6718111df29e332840d4411d79 SHA-256: 1ddabe3938727a7017956a615b60ed45a0ec1344667b31e6d004f7ae81d47427
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability to execute code. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which likely serve as distribution points for further malicious payloads. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/t1dqcdu870sd49354c70vqkm00/jamakagidalu.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1295c3f65a2ac3a4c674122dfa4f8997/rapivibojebijasi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ee9ee57---pabaxevugoligurozul.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6ff46c96136ea0f583a3c2c43815366/64057160154.pdf
    • https://abofahed.com/userfiles/file/32831310845.pdf
    • http://photou.cc//ckfinder/userfiles/files/37264142525.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/dufuxaririsiremoxadufuxom.pdf
    • https://conexkarvan.com/cache/fck_files/file/98564538322.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed380ab587---148143515.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3675488578---90218197521.pdf
    • https://anukulagrotech.com/userfiles/file/zabasenegokisoli.pdf
    • http://ed-web.cz/userfilesfile/tagazopufoxeku.pdf
    • http://lapenya.cat/imgjovesnaves/file/gosokitatakavafim.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609faff04b879---jumisinabegorije.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nl76fc2itd34bio8p1qe6ob636/66961318291.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e782de19ff---36099590915.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d29d592f---18071164800.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608106867b3f8---50726284937.pdf
    • http://sdds.be/userfiles/file/jadununokuforasawemunozuf.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/55a3bf872e9352a2e1e53bd9c22a27f9/16875528022.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/77c60259e1852904821cbc45d28e43c5/bupamazoda.pdf
    • https://chpcentre.com/files/file/11439187726.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/753e55415d91b80645021ab8564b0382/xasiwiduvuxolumulitemiva.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/307465e461fe196f3ed9307f1333e85c/dozusu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a0f6f49db7ed4d072c3276c908641c66/sidelifetepikegutijasug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=easiest+armed+forces+to+join
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000113cb.bin
80efcc643d4af4ed339c954f95d7b5a12947786be87ad37cdde422974b6e9630
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113CB 17624 bytes
font_00_sfnt_off0000fbba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 16792 bytes
font_02_sfnt_off00012efe.bin
f11e7c41fdba0245076c749875f6a123a96297e05669af9f2043dcb589da8e35
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 17240 bytes
font_03_sfnt_off00015c01.bin
d5c92a67a9660604417b833025832468691bfc0ad98e6a21499237796b0f0f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C01 10704 bytes