Malicious PDF — malware analysis report

Static analysis result for SHA-256 8395253e55fe5ca8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 00:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f7efc5e5ed6d74478cfb0f90dcda60f SHA-1: 935b2ad0b4c88dd6f0425a62f6749a06aae0d1c6 SHA-256: 8395253e55fe5ca87a34d240dbcdc12f45cb0d0e925b492c88a9110ad385ad64
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, likely to distribute further malicious content or phish for credentials. The presence of multiple external URIs and a link farm structure strongly suggests an intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.indoorclub-informa.com/boletines/img/file/tusavakov.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608735e500e8c---zefigejixojumesuwizim.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/19805806702.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/94714924472.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/76405199721.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026529a5ab7---53126236130.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/83640690707.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf097d8e6---zeliwatij.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gawevu.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/72379518038.pdfIn PDF document text
    • https://p87.hu/files/38983867241.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e6942afe---77845030307.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b83d6a46---91149155551.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9135ee58c---935866721.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/62524905012.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/3938676508.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6b98tdr41rsvot6spisr4c4a73/vuzavefozovolorowa.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a12ea02d8cca9d647f1f2428acb949e3/lasupabiwavosus.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/kilularokujowedato.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d7bc7eca9---zubuwidarujedudagukumanaz.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/tinubaxakepiwuzatazavujef.pdfIn PDF document text
    • http://gzwep.com/img/file/202182114503.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/farinu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa20ae7bfa---kozobivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=barashada+computer+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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 10796 bytes
SHA-256: f7a27ddbbf82138f213d0045285be2c2fa412493a1d4bc5794749aa215e618b6
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 18088 bytes
SHA-256: ae3629b9897444df053c01ae94473f54bedb220470d4cc2d56c88a4f5e3caa58
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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