Malicious PDF — malware analysis report

Static analysis result for SHA-256 365a7b6cc68eb43a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 23:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 624883c293664eef1a73725944e2d1b9 SHA-1: d71017cdbc74d726044e9aa4d86297607b682e92 SHA-256: 365a7b6cc68eb43af6ed0b6fd56a31057f4dffb674f90b6e972c7af56b2e3d15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent, and the presence of external URIs and compromised CMS uploads reinforces this. No scripts were extracted, limiting the ability to determine specific execution methods beyond the document's inherent link-following capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=the+bugs+bunny+and+tweety+show
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de5c21b0c07f740220cc25911096c2b/labeviwikejuwimu.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11bbcee24---97895273027.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/tirajarowegofe.pdf
    • http://kenshopvn.com/uploads/files/powunidupodukokivatunobi.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded7543dc1---65903181717.pdf
    • http://vidol.nl/userfiles/file/tijido.pdf
    • http://alexlunacoach.com/img/editor/file/muperakategorijira.pdf
    • http://fullx.net/files/dabavisawutejuxivegiti.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/peximupeg.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/14e586d0540b83503452a45157d48d95/tevetofavarena.pdf
    • http://lightofislamonair.org/uploads/files/nowegobawijabupav.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30f737001---91041887518.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075a094d2355---9496191104.pdf
    • http://garmagostaran.com/Upload/file/dorejanefep.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/13e1ba33c5149a555b15a293318efcda/34082092762.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sr9kjpkthkflujc0dtlttu37jn/fonowenalesibolokuze.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/95922791840.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b25ee324---gukugo.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/eb7684526b8d68a72fe9386c4064a6ec/62098583312.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h1h4ceqdgnm0sdprts1bvga2nk/sifizozem.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/21248607141.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c3bba1bd13e84b6ae27b87d28e006d2e/rajejugon.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wilemawenib.pdf
    • 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_off0000edad.bin
b9f9d6ad07b2fe3b729ed23423e3721d175cd629e9f857330060453b62136e16
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16960 bytes
font_01_sfnt_off000119ed.bin
aabe18b57fdb94fd9eab1bdc406e1bbbb73e8a8dcdff338aecfc6a9fe77f32e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 10692 bytes
font_02_sfnt_off0001324a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 16792 bytes