Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ddca994118fd26…

MALICIOUS

PDF

81.3 KB Created: 2021-08-24 18:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d45731dd7d81a7e554c1c80324fa0f7 SHA-1: 63e8678fa170478feb57bdc790e04b376861723f SHA-256: 38ddca994118fd2669369ceac312432012e41d3ab9eceddb0f8176ecd06cd4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbe312382---jefekimazimuratej.pdf
    • https://eklyps.net/images/file/78398336107.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3be7a2f6---77888513613.pdf
    • http://stillwaterponies83.com/clients/74660/File/nowadavagefola.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fa79b8a8bdf---30495807478.pdf
    • http://qianshunqs.com/admin/upload/66896383578.pdf
    • http://myucmas.com/userfiles/file/kuguwo.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a6cb3716b45ff01dc2fdf18d135aea12/19939301629.pdf
    • https://kede.org/userfiles/file/5186565248.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c0d69573---51243954025.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/40387238050.pdf
    • http://interface-referencement.com/userfiles/file/pawejirapax.pdf
    • http://m3hotels.com/userfiles/file/vawidafimejemagawov.pdf
    • http://dui-antidote.com/images/userfiles/file/kujiloduroxavaxuxemop.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/roujlsudfatmdc969q4s4mo6e3/99140130401.pdf
    • http://studioriggio.it/userfiles/files/firagido.pdf
    • http://www.rpv-drachten.nl/files/file/28027233159.pdf
    • http://abworder.com/uploads/files/wagerotunepaxomuto.pdf
    • http://teknis.it/userfiles/files/9037425472.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/zalegejopa.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876073d02f6---denisir.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ff2f182177bf2eb06b4266c90fc6146e/68990758017.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/95649621948.pdf
    • http://homeloanz.net/images/e/file/zajekewupudaxoxixijake.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/db946bc53489de3c0c1a48f530f98bfc/52297817035.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=distribution+theory+in+statistics+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_off0000d923.bin
f7df4153dcbb1bb007645be8e10297c47aaa63e911da22e6120e5e2456b4a525
pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 17000 bytes
font_01_sfnt_off00010598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 16792 bytes
font_02_sfnt_off00011daf.bin
08a5929b186a5989f284d624914d0b22b68b803abad9c237d9f059e7dd7a0ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 11024 bytes