Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f9cd1ef4864d2f…

MALICIOUS

PDF

81.3 KB Created: 2021-06-30 06:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb4f35a9d1be2f181bed73a3b336ba7e SHA-1: 5e4cab7000faa5ecb72dbc3537353bf667fefabb SHA-256: 30f9cd1ef4864d2f2dc1dc736a95162e3cb07654082ef327a38ff47cd9a645f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=words+that+start+and+end+in+o
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c8646054b6585d4e18b0d26f906c28d0/vizaxomaro.pdf
    • http://casier-a-bouteilles.com/file/74216063813.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/sufov.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6e4d59094c5b627fb85b212f34482db0/wasobutupogaxuviv.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d83e31119---15146176537.pdf
    • https://driftwoodcc.com/userfiles/files/lejazekurupowezedisis.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079985863ab5---33752413906.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec786269ad---90891591282.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e4dec090---biwegixukunirepakozenox.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1acedf2d---26026922064.pdf
    • http://icltindia.in/userfiles/file/78933380505.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6eeb6c9---limekaludipiliso.pdf
    • https://syntellect.ru/Repository/file/15826462167.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59c4b5a5c---fujewi.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mimofezarufogaruka.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/clivctk42p8ve0ns2hjmhgslvv/25435339639.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2f4f4722cde1fd633a7d436cb635c001/85308889725.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ad1dc7d2b1646a14dc26171d2d522e2/tawulegexo.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/67478615553.pdf
    • https://mimpishio2bet.com/contents//files/jekinikoduzi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a0653cd1fd2---64798337910.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a55824c7---mutedejuboroxigixe.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157fd4b43a---1121610932.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d78c9c2d2f4---80273829604.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mmr3j0nu03qel0hihrs27kld0u/75131073298.pdf
    • http://simkoongschool.com/uploads/editer/files/ratukipanekiro.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/982e3e2a3c703900244ada1bdc019887/1592702814.pdf
    • https://stvorki.ru/files/file/rodovowejex.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_off0000dab4.bin
db203898046ab5842212f1f84f3b5dd143f7f9b692c7274ece69456443519991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 17432 bytes
font_01_sfnt_off00010834.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 16792 bytes
font_02_sfnt_off0001204b.bin
4730add05a207bea721e853d9fcf947ef0fc368b8bdd221de7250c5123884a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 10292 bytes

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