Malicious PDF — malware analysis report

Static analysis result for SHA-256 21490130a92eb34f…

MALICIOUS

PDF

96.9 KB Created: 2021-09-03 04:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69486f2c11cf9f864731f8f1370ad38d SHA-1: 1ccc8d018dc2fa1f90b7dcbfec2de6c24e5aebd5 SHA-256: 21490130a92eb34feae17866bcecc2c24b1bc7177454d60ce6cb8b2cc2b14950
156 Risk Score

Malware Insights

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

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vjbv3bo0um87uho7uc8vf2tf12/nadozazifarasovagowefav.pdf
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/50207484298.pdf
    • http://lev-steklo.ru/userfiles/file/97393165285.pdf
    • http://djpress.pl/Image/files/kuzofug.pdf
    • http://epicridesnepal.com/files/59790430386.pdf
    • http://firesecurity.sk/userfiles/file/mizine.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a523b9ddf7f---gubagajudagotiz.pdf
    • http://daimarconstrucciones.com/images/admin/file/dilusoxomalamilavux.pdf
    • http://libron.pl/fckupload/assets/file/vexuli.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fd0fee8aa2e15b1f15357a26ebe984a9/31889995859.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/80228521131.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ba91613d30a6651abb0aacd1eb700058/66008229747.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d760e9b66---35791420346.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5f215f2c---kalijepizitinipesadozawal.pdf
    • http://bcslaw.hu/admin/fck_upload/file/zanajubaginejepukutup.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/88852466490.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a8723e10be8188a13acdd26eb6177597/kuxanuzixidulupufofakun.pdf
    • http://e-park.es/img/uploads/files/30997775084.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/59264989265.pdf
    • https://yodishit.com/uploads/userfiles/file/kokuwuki.pdf
    • http://blpest.com/UserFiles/file/19290749400.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cb50b0012279b7eef5c6857cda3e94a2/noxasajuzibudezogubokeza.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bpnocus0c3j4114n9eo0oohfdk/83568329613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=romeu+e+julieta+livro+pdf+baixar
    • 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_off00010cf8.bin
eb7c3b918b414999ca2a8b389d2ffc1d1f7c943234ffb1015d01c257e2527214
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 22144 bytes
font_01_sfnt_off00014472.bin
9bc3d8be8780cec0797a6bbf191cbb082029d52e36a05f945a0496545ab39470
pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 10968 bytes
font_02_sfnt_off00015daf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAF 16792 bytes