Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f8671e3303801…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 12:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 709959a79d0301dce7744a52276a6177 SHA-1: fbeac33868b9d1f4582142d578cd3276dcbe588d SHA-256: c25f8671e33038012e26d62f0e7d42320853611cbffb0a26d237903750d79f77
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, embedding numerous URLs that point to compromised WordPress uploads and other sites. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1192b6e642094745ce0bebccb58a1fbe/kaluvizogad.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3ca4edba---kuteterilawodorokog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c022510b74c---ruziginizaxobigeragali.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/buvetoderuxidimim.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/kapabefufebevuj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f278c99e12---87826896147.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/virir.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/864a1e24be3cf8573162b6eb2ed30691/dakapimugixefuko.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/ziwetokexi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/todekar.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/47215754430.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93eabc6447---tukatowixabubezeruwosivun.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16095b16f3311f---2402593720.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/40157079555.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fodolevevafomisa.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/54916608216.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/12870422041.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/141411194905.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/46364951887.pdfIn PDF document text
    • https://sunrisepool.net/userfiles/file/xojijebo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/305221f5bde4b8ba1a88b7d471aef189/28056379488.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/51407146752.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/telidarogoxalebigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=visual+text+comprehension+worksheets+singaporePDF 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_off0000bdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 17296 bytes
SHA-256: 6aa1df7b78e849b22437b51177c0700843011b3dbec9d62f09943cbe1b429763
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11168 bytes
SHA-256: 2516ae1141fcaee15e3c78ad618a148ba9edca9b6f56daf13256b30b22574f5d