Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b29079f0de0a77…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 11:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff6007a76e8d6f4146e85e0c2119d847 SHA-1: d21ab2278f06d2b8f10ea260e7883e4d0bd6b065 SHA-256: 43b29079f0de0a774cfa7e101e466c5e35e4d3bbc7e2cca73f6885e272462e48
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of external URIs and link farm heuristics suggests an attempt to redirect the user to malicious content, likely for malware distribution or phishing. No scripts were extracted, but the overall structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=summoners+war+lost+centuria+download+apk
    • http://vo23.ru/upload/file/diduju.pdf
    • https://sunsetlearningcenter.com/userfiles/file/5376287300.pdf
    • https://jiu-hang.com/upfiles/editor/files/tusewinijip.pdf
    • http://angelescare.com/userfiles/file/40567831130.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cbeb2168---rapev.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/de93df389e1d60eba8b2ef465d94162a/pimaxudejugilidorip.pdf
    • http://studiorestagno.eu/userfiles/files/8027642583.pdf
    • http://berbun.com/user_img/file/gasamugedawanasesotaj.pdf
    • https://ibeguiristain.com/userfiles/files/diludamemuruvafevevi.pdf
    • http://vagtteam.com/userfiles/Files/zolovoziravow.pdf
    • http://mrpokedb.com/uploads/files/33820854898.pdf
    • https://ms2oke.com/contents/files/mubusesigogawanaf.pdf
    • http://inciboya.com/resimler/site/files/4287605479.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142775697e72---serunofewemoloripapumekux.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145313157dfa---pinonebudonubofubotubavik.pdf
    • https://zmiz.hr/userfiles/file/kigat.pdf
    • http://dynamic1984.com/user_file/file/xexepuvatuvozekotudakof.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nejevanopugafezinuniwe.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sewasox.pdf
    • https://fa-vietnam.com/webroot/img/files/4725694140.pdf
    • http://zartmobilia.com/userfiles/file/20210916210231.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f11867c7---tomufaj.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/ruxefanozepudunere.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_off0000bc26.bin
d989ed469351c104e843fd3eb7420518158663b25d5c4acc9bca0dc896b052e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC26 15924 bytes
font_01_sfnt_off0000e530.bin
c8c9825b92610f2b2f401e10f8c7e7750d0fe69ba41b9222e40830cc6e49662f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 11028 bytes
font_02_sfnt_off0000fedc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes

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