Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd34fc6d5e18069b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 22:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4c2ee542470d3906c3a99884347145f SHA-1: 162dd094615f2d35b5735a677826fea3825949fd SHA-256: fd34fc6d5e18069b0cc0d5d239752d3cb50ee78c7bce3dc7285f634a92c6170d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d77a3b43---50204815272.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kgl5bje1b1dgacehoj7o1v34r7/44496312675.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/474c018cc6a992cd3acec4b30f89905d/62807079661.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/82095928508.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/foxuzuxerasebiresazakenej.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/zurububuzelevoteradopebeb.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3a69e898---firoradupudawebifom.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xedufasav.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/lilogejuminuxedokafimi.pdfIn PDF document text
    • http://saydersan.com/firma/files/posiwazupitad.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/15028060725.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/82989841258.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837f093fc61---mozafeduditobufijiw.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/togifu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/65501600bbf5bf68f90afd23cae6f2e5/47523837526.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/taterelofomidevi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/55lh6b6k3mpoi0a8qctg8f1964/kidokazaf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d553cd0c3---75740132048.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a25f91f9ae---36801872114.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/luzezotafegus.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ac2d1f38---gamibaf.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a9ebff2090536ffd06126d1aa227ec3e/jepebumobodevevam.pdfIn PDF document text
    • http://i-dron.cz/data/file/8494898116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=geforce+210+specificationsPDF 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 10760 bytes
SHA-256: 1312b7a63013e311592e63cb612339d7af278562a9f441d342740262a02d8ab2
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 18024 bytes
SHA-256: 9cd87283749ebcd23fa86641f840f913dc5fc1907cd77c2632dcb3a830f5c1c8
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1