Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae49c6699f03e38e…

MALICIOUS

PDF

78.3 KB Created: 2021-08-12 17:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e08271d56b8c11a3a589b0b73c26208a SHA-1: 9501468cc2f8d1c60a030eb4b4b9475087b9d5b1 SHA-256: ae49c6699f03e38e15a5474c900e1f6c31fb703d3f03b855603d6478f12d78cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=i+survived+the+shark+attacks+of+1916+free+book PDF link annotation
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/13861024055.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/970341bf159cfe195e5fb297999105b0/20496361807.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/41911720370.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fusogemagefipinewe.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/87c069a4d6e7e04b06d8f3f0eafcf32c/rusizotimufiraso.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/tazowekonikob.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/samabekavaxebeg.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6d496979dfb9dd88bf1b7f08fa8556ec/fazewomelikakabe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fuwalajazugakuvow.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ffbbf176c---36404626103.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/05a39806fb4ec9c645c5a9b2471d525c/36532001539.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/40790711191.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608686ae91204---lufufojibixedowenafarewu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/38531118351.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/wuxatakokubif.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094725d1e3a6---77230535983.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ef9b20b---puvamewulimakufanef.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/rotus.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa0e82599---zokurebab.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j56q6k3cok31ve07rkk4ul0os4/81416868681.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/zanitusas.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/panaporutaxo.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d6d3efb5c40d9e7c513a26c808877707/zomemewanavigogozore.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2dbabe34d---zuvibemabumikiwa.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_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 16584 bytes
SHA-256: 165030853aecf0a284dfb41bd2e603c6d8750bcf7c2e413eeb630d4a39b5ed63
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 11160 bytes
SHA-256: 45f1635c8f491845a2c82343ae55e4731bfb1f8e907e593c824d21f336ea8960

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