Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0c4ad36eae9dcd…

MALICIOUS

PDF

106.2 KB Created: 2021-06-27 23:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28737d78a01803d2cabac3c9c91e5b50 SHA-1: 1f1fc41ab6d3ff749228e45600baff3c01d9ceae SHA-256: cc0c4ad36eae9dcdca7f77ac680f00195efce0c09f5f87c68c6809c32f4dc7b6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, many hosted on disposable domains or using common CMS upload vulnerabilities. These links are likely designed to lure users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

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://kiiga.ru/userfiles/file/40994106563.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xixulos.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607515818eb73---6329741573.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c469dca0d698366ba39d732a6a55a05/namovupux.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee705d56c---87861490471.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d8641511---tagufitusagukorubudopum.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hounkvhik9j8ebm14t03siult2/91588168131.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/mopakezexakasejafub.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqpbi8fcnd6orsv4vucod0ln05/51331535352.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/79113631629.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843d6dde31---5030182121.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f852c1acaa8f106ed185db75daffcd4c/73179208581.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/bawiraleturepis.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/33703005039.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5632658bf---raloderagizujogedi.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/69430665228.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96c3bc503---xamoseju.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084feccbc5ae---bogap.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd20f3e8d4---34579589990.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/95294127034.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/35103068907.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6d549082---tijefofobubidab.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xunezerumuvanesobi.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wegaz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/92a394017d959aad87cc682d55d46ddc/38672193995.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/j8692445dmdu87iha36nticec4/babugelemodav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=another+word+for+ratificationPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000135d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135D6 20948 bytes
SHA-256: 77f866a054c4cb0c4c4cd7315a546895031a46509268dceb8f2664cc952ebee8
font_00_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 26160 bytes
SHA-256: 3f79799e43711779f91c8df04b66494cdab5edfe1b9b5ec3a665edbed08710c2
font_02_sfnt_off00015b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001739e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739E 10424 bytes
SHA-256: 04d1a05cbbb04a1e7d6e32dca6aa127258fa214e607d3f8e724dfca3bc09dd40
font_04_sfnt_off00018b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B41 3412 bytes
SHA-256: ce8ce05745f9fe3cc90ebda2c1f5ee359d8f02612f3a2b8cf1bd881cf2c13aba

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