Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6b0a454da099d9…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc7e7fb5f34545e418bda4e48c34655f SHA-1: f5cdc579036836147c5b78e79fca252a54decf58 SHA-256: fc6b0a454da099d909e7339aeb229b6884e077136d7f8f573441e2d0baaa17e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://stehovani-ostrava.cz/static_pages_files/file/rikikaxajex.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/97058777852.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e4cfb483a---dagotoxiguvewezasi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082331612e3e---45582957875.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/76039729367.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098847e69f9d---73219845385.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90d47c9c8---82352355316.pdfIn PDF document text
    • https://aedwea.com/upload/foto/33841459247.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7becb084---87557112219.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f928074934bdc3604d476cb2238bb28f/fubevipa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6k6m5hfme1tb98rva9j1fapbgv/71044137517.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eaad28065e36f86a9e5e2768a4980541/41288043261.pdfIn PDF document text
    • http://www.heksan.com.pl/file/52556431028.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5b67c0347330661b1e06cbff1eb06bf5/51290596280.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c2356fa516cee659bcbb599e68b29094/90134334684.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/fotavajetenel.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/47o0tk24qraonffat3crt9ei11/8744178554.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/13ov80qnovi811u6qdh8t62h8u/2514526838.pdfIn PDF document text
    • http://aimic.com/userfiles/file/30105729281.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a070ebcba40---74690533228.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/b6t51j7rgu8352tl7gs8hrop86/30677185921.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/wojopakafufijonozevup.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/84486473540.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/39968353865.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/72708ecf8b486113d72fd8d3a739e92c/29913827951.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d77a2af6---pebumakigaril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dynamic+equilibrium+science+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 17788 bytes
SHA-256: 75b60197d0b63a7335fb355bab30918716fd0a57833d80df14cbcaba0b0f23dd
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 16276 bytes
SHA-256: 9fdae94094d34977d7a4a8ee540832ed150dfa3c4a5398deb7ec1514863fb06f
font_03_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 11140 bytes
SHA-256: 51b721400ec8808dfab27409c15a7595aaf9221839db08150be6bdcdb625b6e1

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