Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc2c5e356d0bc0f…

MALICIOUS

PDF

83.3 KB Created: 2021-06-28 04:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd0af7f1c4cc055ff539ec1de7a116a4 SHA-1: a7766ce6a7ee64488c8b8c4b913d3357132c0d8f SHA-256: fcc2c5e356d0bc0f6b5559af0faf46c360307bef07a62c770b1a39f781776b17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gsd8165snkl3088esdfpskbdqh/82501327237.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4amh0jl26cr0v7gp955bpmcqac/vuberonotepotugizose.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihnum5t3loceqfm2adjgk04ug7/55051887336.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e04339d20577a4cd975c36239554b9a9/93032508486.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1b52cad59af357e89aab10a859c2dc02/31459676427.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/94791681287.pdf
    • http://esistore.be/userfiles/file/63287287343.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822d3f4226a---55920008864.pdf
    • http://modern-pro.ru/files/file/76409668943.pdf
    • http://gsmontaggi.it/userfiles/files/zemedulewur.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1c885b5bb886544c24052ead6c95f04/mutulidujekade.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41933213480.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf85061204---2211524210.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/269d409d8ce520efb9e5138eed97db23/41925681224.pdf
    • http://www.predia.cz/userfiles/file/xokepotamenibukivukogike.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xapugi.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c203e1312---guwaxidisax.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vufefi.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/tokexefibikuloguputiw.pdf
    • https://iwnta.com/userfiles/file/kizadatuxuz.pdf
    • https://clove7.com/userfiles/file/pozuvufepo.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/fopavorevapapetusewa.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ccf054a1---46028263508.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd7d3854a---fogizunutoragorikufatafe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sprint+backlog+meaning+in+agile
    • 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_off0000e3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 16792 bytes
font_01_sfnt_off0000fc0b.bin
68c637fc52a6089ba22b363e2658dd634d4e0579c7beea4f3fc78caf09cc2812
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10856 bytes
font_02_sfnt_off000114e2.bin
1a5bcb39ac52b1b00ff47ccb61d33d982e8f0caef81092b70fbc5f95a5151645
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16620 bytes