Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca694b09da94156…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 19:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a38caac4666e20b32b5b74850705239c SHA-1: 0cf1dc8e43602b59caf7e83110136882204e4e1e SHA-256: 7ca694b09da94156f8597788b369f41bf93ee775df77db7e0e4b6697d5e3c130
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for further exploitation or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=new+mexico+squirrels
    • http://bocghedanang.com/media/ftp/file/tusiwikezopekibulew.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608013bfb451d---77117396609.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d9ce3ccb351834ed08b16367ca7a2cd6/kerupan.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qqvupc2p849ucbi5slv2815j4h/bewesudagunetukekimo.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9f7p9bf6ofsivpc6e9qdc951l2/87875238665.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/55f2a742f3d59d18b5d72b294fb6b50f/86183679607.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cafe9866---nopunafobiwezikesir.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d3027cbe0fc80388c298929f0461ecca/55684465359.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/soxukuxigaxutogedalul.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1ab4ee639e5127a3d5da8ec239e210ef/wobirisuvuwotozeme.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/37675554820.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/torgsj715b7l86ibp3vu0jgutk/20970071028.pdf
    • http://hagelkonzept.de/userfiles/file/pabigefidijojega.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a2b4070a04982aaab41958202e74db78/zezadixazojuxokar.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nn9jgkrsafqjjgeu4nulkoi09s/82021276395.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7776100b92---96425032364.pdf
    • http://fujavietnam.com/images/Download/37126195332.pdf
    • http://bjbtrh.com/files/pic/file/nanaginadebetex.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/jefogovizawexi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fmfn2tsa57r6n7eklu3kpv9v43/jurafimolikinofo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752af6655a0---ligulijivifunovol.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878d1250a9d---26484606285.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q93akkics68j3ul64dnfg655rb/40241370350.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d87e439fd---33786431524.pdf
    • http://fitviewer.biz/files/file/35422197138.pdf
    • 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_off0000fb31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16792 bytes
font_01_sfnt_off00011343.bin
e6fd84f80f4e9bf38f0dbd8b5201db7abeaa62f2d6b90472642784770fec4e73
pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 16728 bytes
font_02_sfnt_off00013e92.bin
a2eb5a319dea27b936c1a2f0f2e6ea08c04685469cfebe8ef03e513b9fed0e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E92 10436 bytes