Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87a4369a27835c9…

MALICIOUS

PDF

118.2 KB Created: 2021-07-27 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bdcd5d606e7c9afe41c6f45bdedba6eb SHA-1: aecbb620e44a46902e68292106f37d4a4259bc16 SHA-256: a87a4369a27835c96010e3e3e9157792383ff5fe0fb1f579caeaa00590598c75
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/09ftim8sgodp4750taa74palbo/49664006593.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec420fd1b3dee6fdf636d91c2e9405de/lejadegojamebu.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/samenukozexobolasapoxegam.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd2218828---24304056751.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00f749013---lemixawutaxikefinizidu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ff9e3dd359d4344e2a370aeb195b88a/bonumonujumamodoxa.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/95801317608.pdfIn PDF document text
    • http://mega.kz/media/upload/files/94798347676.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fea4fd7e---tasimetusukedadiwi.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/45685801265.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14402041588.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399268696e---95855237047.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/8540885388.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3dc24795bcf04e83abea5dd7eb5c2a5f/kekoranibat.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/650bf5403ceeeb45b4895a65c06f472a/wagosaxogij.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/qe4p50tutfvlsc9n40nkuuj1a4/40690203033.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26947e43b0---kamime.pdfIn PDF document text
    • http://islandpointfl.com/userimages/46655011191.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/jutijugobe.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b7bc4e871757f3c4ad5890285701489a/voxemuluparoj.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xakirivagij.pdfIn PDF document text
    • https://papiratisk.cz/soubory/losukon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+biblical+meaning+for+the+numbers+511PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 17808 bytes
SHA-256: 9dbd261ea0cdd848219054dee28931766d9819064beaa19fab1e94d83cf49390
font_01_sfnt_off00017a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000192b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192B5 11200 bytes
SHA-256: ba1f0d265281afb03e18365e4bc04ef83b6e947280483e516daede95931e166e
font_03_sfnt_off0001acd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD3 18384 bytes
SHA-256: 4a83a991df9a10f95ebf48669a15ced70dee15980b1b9fffd20a3fd24b75f656

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