Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd499244a1089d9…

MALICIOUS

PDF

135.8 KB Created: 2021-06-26 07:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92318ada6a8a781b9b2fe902cf5ad9fb SHA-1: f73e56ceebf3268e5027e1c5adf91d9a83bd7c15 SHA-256: 0cd499244a1089d9ef01bb9be46deb721596cb3c0139aea05fb0e5bb2012ac73
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting. The embedded URLs, such as http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088271846e8c---bijefefixesosa.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2622ba95ee---55209201629.pdf
    • http://elitvorota.ru/f/file/58014601449.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/37415312a0cd9ab2714811e6d13e6044/mijejotiwiwiz.pdf
    • https://muzeumkonstancina.pl/attachments/file/96633919401.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4885086cb0aae7774580f8df493d6c68/poravijopipufuko.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5e4ccbf8ed0043052c30c1459048e4ed/69222001744.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160851de844e5f---18753830253.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/bf80b73f9fb5a8e9ae41fb83debb69f2/murizu.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8fcc8550---81663079314.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/bulopumowosefofa.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0oha1k9q4bjn6mieu530c5juc0/kobolajepuwikot.pdf
    • https://pendekaremas.com/contents//files/16845943846.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f306e84552---tejinibubunifa.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6v1n8ni9ms0u4vhf01cn1474ih/74861363018.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f511ecb0b5---diwidujazepaninanogami.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2k930sebj9iod29uo6cqpib6m4/kegabixapepixalezomo.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6745a84d8dd333e684fed15b8d060f83/fepexitidowopitipudebe.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/80544179997.pdf
    • https://advantagelic.com/singhania/downloads/file/73493023522.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c76a55404ac629311e2a5d38b8b041/25130667251.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608503825f3b1---kalekegavivijokulopi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088271846e8c---bijefefixesosa.pdf
    • http://americanewbie.com/userfiles/file/21575502723.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t4dutnancn76nk6g0nn6u6tq24/jujifodutosepetiwow.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7688f89e89a0ea894841c84b77385e54/didepipobopo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=give+me+the+definition+of+anarchy
    • 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_off0001b386.bin
9c6c1620ada2433600968786d11e6b1143b4740a47140fbb7e6d4b93a8d5c7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B386 10744 bytes
font_01_sfnt_off0001cc1c.bin
7d9866833d97bfc9bd674da48b212f31e5e36463301b32e324c6aca50e4de453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC1C 17404 bytes
font_02_sfnt_off0001f964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F964 16792 bytes

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