Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13a76f71fafd63d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33536c516a031cabb80929c2631eaece SHA-1: 78d0c82263295efb9bb898540eb058cbc656ac95 SHA-256: d13a76f71fafd63dea9d013f60a6f4d00e608e6059373b528fd3e83d87150ca9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=among+us+skins+ios PDF link annotation
    • http://kronospan-mofa.hu/editor_up/xegotijexugod.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c5397caea9950eed8f5e08a0fb617f6f/35470347646.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/81554689894.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c03a20a76---68861500656.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/lezibisobor.pdfIn PDF document text
    • https://avflash.nl/upload/files/ritibolasowe.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/69790344719.pdfIn PDF document text
    • http://swhos.com/upload/files/97722826977.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131f50f01145---wixudevumajukozazibeponi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/zuvateninamogugawun.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11664359140.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jefabevej.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/datakidurase.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141b45d8f79c---xeziwovavufenigekuvaj.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/29215737362.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/zepezodifudevojepigol.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/mofusabusedoxe.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zadil.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fddd383eee9eef31a55570fbb6dfd25c/xesalevisegaxurezo.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/60701101989.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/21133612185.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/vexobukorezaje.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61661785977.pdfIn PDF document text
    • 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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 18980 bytes
SHA-256: da7edec4b2cf9ba6e00e8517f976b6886faeeb0648bdba80d751b90aea939234
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10084 bytes
SHA-256: 6973fc93e1c0d34bc085d1f65b341a7c6830420394276dea449e189abe7f5d52
font_02_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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