Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdc1c6096a4f2ee…

MALICIOUS

PDF

72.0 KB Created: 2021-08-28 21:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 100e8a9245bff0e272cc58a6f0da5385 SHA-1: 0373b086d7a989ac69c60f94e5ba51f208ec8d32 SHA-256: 7fdc1c6096a4f2ee24f440e00225d44f1c8f24fcb2aa21b57925b8ba34c00492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely serve as lures to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=southern+pines+animal+shelter PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/651d2bffa1c7ed5cef1d6a9e33332c50/72931413184.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a10c07ee2---73892968263.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e67cf891650---xapagesimokesibaxirenuv.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/45570785447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d5a99c57---78130862825.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f8936a0bb---39563114952.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xikifugavikuw.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/25009703899.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • http://rinsacars.com/files/others/82910100237.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/66968739982.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wusamadogaje.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/tigobegisa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3ce9d7145b50a44e977e2eca5400ba3/51911518158.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/kinagebura.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/kokigosedarewagalo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/dff8141f1ad45f019fc99d344775d0a1/funebebilezulimamijuzas.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce19e2600---potibisezoranubilafewur.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f73c0b9288---tijakibobomanigivi.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/71958065797.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/50867959111.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/25136724471.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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 10692 bytes
SHA-256: 7b79cd6495b8a009c48a04b5ffe4de27604204dbe036664952b2eb9904053b95
font_01_sfnt_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 16688 bytes
SHA-256: 37e85630bf44379e50730aaa06d3bde7793d6d2a844c2463a1701dc5c85378f1

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