Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f95981aff70bf2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 11:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09c94b61442a1987eec7fe53dfe79da1 SHA-1: c67d5d6882854880753ce9bb8d97da22d798f2a3 SHA-256: 36f95981aff70bf240b8d69eeab5490b31bf2ef3b1506b96df0eb4adc53660b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of a malformed exploit stream and ML classifier flagging suggests malicious intent beyond simple redirection. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=kung+fu+panda+3+film+online PDF link annotation
    • https://markapin.com/calisma2/files/uploads/36474902782.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/mawibeneder.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/32509604229.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161375b9acca95---57405267458.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/bazomilozexirepuk.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/6765231654.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/43548306882.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/topokaxuwizusok.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/76457480356.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/37988723336.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133794fdc8b4---81429615035.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/xeworo.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/fikibinarozaxodinu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/54193241306.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/1784005603.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e365299005---20714571919.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tukilufej.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317893edb3a---ligubakolumalaseja.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/dopexizuzixidipowemu.pdfIn PDF document text
    • https://dukupahit.com/contents/files/vazozezanepakuvesigiju.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138c66798a26---xigejapusi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/20358352164.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/kikixigebujumulovamesebup.pdfIn PDF document text
    • 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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10740 bytes
SHA-256: eef5f1362466e6d3aa14a0e7a9a6903189676a4b880815d935477ddfb75f979c
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 18724 bytes
SHA-256: 74d71f5f25a5a230fefacdbd1e8f489dd8ba644e0d5160143e90290fbc3b20de
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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