Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ad583ecc1184b8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-22 11:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc162b23f9108801c857dedba8ef53ed SHA-1: dd6ce00ef8b0b6b0338548e89cfceaacb837b425 SHA-256: d8ad583ecc1184b812eb9b19c69c120db0ca9ab7e7f736d3f9dddc7972e531ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The file's purpose appears to be to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6540

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://aggengr.com/uploads/CMS/file/11969050197.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3c433fb1---menuzasanexowabunusunove.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/milozilawofikobu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/42687763646.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae0cdc98e---dazikutixusitijaduzufes.pdfIn PDF document text
    • https://bem-sa.com/img/file/3285547270.pdfIn PDF document text
    • https://buka.ru/sadm_files/16065784464.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/23907496394.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/82419561396.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345ac5d6218---xufulorok.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82349405737.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2bec1eb649c1553f013c8f1b10b53764/19435324727.pdfIn PDF document text
    • https://davnosti.ru/upload/91306042380.pdfIn PDF document text
    • http://autodilygood.cz/files/file/mugevapuk.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210921060854.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/49729128753.pdfIn PDF document text
    • http://ailizia.com/userfiles/judivajilelog.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/56965678894.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/54890667805.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/puwedanuwesewuvave.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bukazojupe.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/dusunekepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+downgrade+softwarePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10548 bytes
SHA-256: 97cd5e175dd3f603f4e9d15e38d64a4c7ddfa54b8b480862fe781de968d6c7ea
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 18024 bytes
SHA-256: b3d70a93741bca8b1a42ee94bfc1bbd2c4ac71bd32006b7e7f2b63c372ffe32b

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