Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ccf376205b6137…

MALICIOUS

PDF

77.7 KB Created: 2021-08-06 12:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b135b0dd291c326b098569b6d042cc76 SHA-1: 0f67341caf3781fd9589e5f8839ba779a50573a5 SHA-256: 93ccf376205b613742203d92e07109551a06a5e2a953ec668a6e2564d10ba5f1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507041716789164.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c86da9928e8---kusowukirej.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/c6r7rqtiutki1t4nqia46spf4g/38506137021.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/sexozaladamisivakugo.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/10660582707.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/gavuwazejagurad.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/def1f66b266dba9871136ea08b0e28b9/bolixamadubazesidip.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/63408241738.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d6d4a861633696de701542d85ef11477/27128395808.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1c39bb0607bee2747b7950586dd6ff81/lirawigixodawerozulanami.pdfIn PDF document text
    • http://erex.hu/upload/file/dobitabugu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071df4881cae---17322617196.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b59994231d---bofokamukulilagorerumogaj.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/44139183024.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/95980195919.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/69076718883.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/56836731569.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162403382098.pdfIn PDF document text
    • https://yodobashi-church.com/firavisivunex.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/38034050963.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075050339ef1---58641596158.pdfIn PDF document text
    • http://beateromer.com/bilder/file/josipaburoluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+resueltos+matrices+2o+bachillerato+ciencias+sociales+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 11360 bytes
SHA-256: 042183e5526d53dcae5aa300c30d217f36536c2260767ae4f1e685b5595b2187
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 17968 bytes
SHA-256: 6157ff78a074e567f44ec5bb16e3dbc23bf11b7da4a30672273b3063beee57c8
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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