Malicious PDF — malware analysis report

Static analysis result for SHA-256 213f28dc01a7e30e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 11:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c2a05bf3d35d1bd764b4bae306a4758 SHA-1: 69aab0a2d60b8459ebda1b5494f2672201233699 SHA-256: 213f28dc01a7e30eb867863f807f9e378cd55f952ee079f918d209075af8947b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate the redirection or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bfr-bialapodlaska.pl/userfiles/file/bepozijunitodawasu.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/konobutimipavedafagegudad.pdf
    • http://kientrucphatloc.com/upload/files/44535285628.pdf
    • http://dayou.tw/uploadpic/files/202109101758422240.pdf
    • https://fajanav.com/aym_image/files/begutazuxunuputikasilux.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/58366716714.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/97849690147.pdf
    • https://profession-your-dr.com/uploads/files/202109151108479538.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/38358276855.pdf
    • http://augustaelectricalwork.com/editorData/file/piregek.pdf
    • http://shamayachts.com/upload/file/komef.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304a832dcdc---berigavudokekaj.pdf
    • https://fortworthdental.net/cmsCart/upload/file/91930810059.pdf
    • http://eshop-kocicinadeje.cz/files/file/2294087301.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cda2d8a2---96421688639.pdf
    • https://erdenet.mn/userfiles/file/36821078002.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2t3iuoi6gs3h3aqjqlfde946j3/walana.pdf
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdf
    • https://refakatci.net/userfiles/file/dofisinagupalajebasowuba.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/noleko.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2f623843---watumesipexotubovidobo.pdf
    • https://farsiherbal.com/cache/fck_files/file/5917993396.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16137ad01d9799---72445622225.pdf
    • https://promaxsuspension.com/csmimage/file/vodanamurawagiduviroxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=neo+geo+cup+98+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca6.bin
381bc06f51d0294d8d24c0cae948ad8b26841f34807f46807343de0dfd832896
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 10964 bytes
font_01_sfnt_off0000d608.bin
ae82d67e24bfd8473ed6d31b34166ede6b39787eb97bdf8d67ba9708661d21ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 17760 bytes
font_02_sfnt_off000104a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes