Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0585e13437f465…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 12:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d125914f4fe0e32eb08850675c19a372 SHA-1: df80a814389a2126c08b4b8c513e54740b388ed7 SHA-256: 7a0585e13437f465c6fe05215438e8097c0478716216169c00d5787cfab482c7
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links to compromised WordPress upload storage. This suggests the PDF is designed to redirect users to potentially malicious content or phishing sites, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdf
    • https://marblobathware.ph/app/webroot/img/files/42312981041.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a5b3f13---mugima.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343959c4680---5801965616.pdf
    • http://motorlustor.net/userfiles/file/sadewokuwivupafe.pdf
    • http://northmarking.com/userfiles/files/25159636289.pdf
    • http://agriturismolescuderie.eu/userfiles/files/59820402044.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c8c9dc44311dc9a709c798fa66fdccb8/letumuw.pdf
    • http://shiokuda1.com/contents/files/felarit.pdf
    • http://qdjshg.com/files/file/nojinizonaxe.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/02541ef094cdcde52128e921e9f0fb1e/sedivelifimi.pdf
    • http://baracenter.be/userfiles/file/3998998076.pdf
    • https://girisimhaber.com/uploads/file/35887534440.pdf
    • http://erainbowrealty.com/userfiles/file/gisozabolibepuwilatafepew.pdf
    • http://yule-sign.com/upload/editor/file/20210902232842.pdf
    • http://servicedental.it/userfiles/files/710824098.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wuzovatud.pdf
    • http://18554080.com/userfiles/file/60863239249.pdf
    • http://umrllc.com/userfiles/files/87562595509.pdf
    • http://bischofs-scheune.de/userfiles/file/82075828263.pdf
    • https://palezieux.com/ckfinder/userfiles/files/55632404478.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=one+ui+2.5+android+11
    • 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_off0000ebce.bin
52c586a47ca029343f3b9c17c6e0883b95e923e941258c54b720374c8e9b6eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 18252 bytes
font_01_sfnt_off00011be0.bin
0a5e1a857423ea3eb87fabd81afaf4fad375725891b4a6b7877aefe14a28e6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 10424 bytes
font_02_sfnt_off000133bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 16792 bytes

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