Malicious PDF — malware analysis report

Static analysis result for SHA-256 df38259b32115d62…

MALICIOUS

PDF

75.7 KB Created: 2021-07-15 17:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c2240d5fa47341583d284a808d5095c SHA-1: 2eeb317812515ed5ee1d1b80fe8fe4687e4c6317 SHA-256: df38259b32115d62c28f64fde04d488b853fa920688567f0292f4fe69882c644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8fd55ead3e0930e1fed3df3baeceefb3/tuvujegubodexanidi.pdf In PDF document text
    • http://frangarcia.eu/upload/file/79359392948.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/45sbvoihheiftrfqnp3360qv1c/ruvizanutoz.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61862114645.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df4bf8324a7---55596841698.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33418809531.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080387987150---repetivobobusoxefuravuv.pdfIn PDF document text
    • https://topupdana.com/contents//files/tunakipadetijafuvawuz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf767c25899---51076326758.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607124ec890b7---36479712927.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7066385386be6925b1440eaf8815e7a1/86987967798.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/wututumovizo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7a80d6687de1b84e444bfd5ae5638a4e/3276673036.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/7421700069.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lemakepidojamoludituz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a52d7j1m8a6vjq4ls7rjvm1or4/2026348956.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6daee63c3e608b7580532960c5dbb168/23612661884.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/rusavexusipebewaw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609800ae96b83---50004440530.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/xezabigawuxedojegezedefiv.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/55927990702.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/49e6aa53ce675fbac01ce451f06f2b77/86881905986.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d2ce87290---fumoxajigide.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/61943137281.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/nanajatisidulufaluwuroki.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/pifaluvepesemipuzefeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+hobbit+chapter+14PDF 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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 10384 bytes
SHA-256: 7b112076484ad305077ec7936734f910f526707a606fb5278cc47dbe62a9f5a8
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 15712 bytes
SHA-256: 1d928e52be7b339b5b3d3a023ec955d35149523474679c75e34713238d31903e