Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a79423309815b1…

MALICIOUS

PDF

78.6 KB Created: 2021-08-18 21:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffa8c01204ab23693309967515379869 SHA-1: b942c6542d7f89256fed0ff4152f038b37e55f0d SHA-256: 01a79423309815b1a880d0462aa7ff70bfc95f99a3f26367b35c6b9a159cbad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and compromised CMS uploads strongly suggests a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://farmaciasacoor.com/site/upload/file/murexedodorojebeto.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16110e339669fe---58400557115.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iufrkobppepvs5bs9meu4dm5od/22517543908.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5284ccc6fc---sipofalufinefexaxexupisem.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c682989a80a---95640803983.pdfIn PDF document text
    • http://sy-smile.com/upload/files/88275304787.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nf14mlofseio17lsh7ctmr8uh8/sewubumalaxakobafebu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/zawelalonafazaji.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/78023928413.pdfIn PDF document text
    • https://bem-sa.com/img/file/gekizaladotenamapuk.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/91664315409.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/30777623100.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1lq066bp6k8b40tcge5rcop10c/27462372366.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27295a9251---sevekup.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7954a71fbc4d8d61c545fe475e0ae1d3/22340710411.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/5842610983.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85396eeb29---20540173129.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d751aba0---nuparaxiwedodizage.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/31310852240.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7f75c5cba10f14e064c043ff3b6c83a1/vidumi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ddec3feb---45832201720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=la+familia+suazo+worksheet+answersPDF link annotation
    • 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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 10772 bytes
SHA-256: a050e38ec96bec3075e3cfdf6af65f81b50c8964ee986ee6418c39022371b272
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 17172 bytes
SHA-256: 3b2d1d061448eafb9e0235214c25162158669a95712aa9b34caffd2387cc8f8a
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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