Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c50b44cdf784e4…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 21:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e07a51d86dcf065436ebb6784b440261 SHA-1: 0f0e386380fcf79ad4d3c78d8ccae1474fdd141c SHA-256: 31c50b44cdf784e4d89f7ccb8dc652b072ee0bf92f4208c7b318b290e65092f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic or host malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple compromised CMS upload links indicates a pattern of using these to host or redirect to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608f723e1b634---40478280085.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rakugobezimanamam.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9f13c8f7---31971720895.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3043398e51---koketutuxewolet.pdf
    • http://bobiniauto.com/userfiles/file/jogazu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf3471acd---buwuboxedovowakedonif.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77009159276.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d70cfa64248---sipawidaxatelirogoparigow.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ade11061---borubaturolix.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/927d00634e9bd3906bf5061191f0b10b/mepofaz.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oui2fu22csj8iaafevlvqr3337/dobetamajaluzugix.pdf
    • http://naturallabs.fr/userfiles/file/nefeko.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e8f12f92---69539780498.pdf
    • http://magnachip.cn/userfiles/file/20210516183706.pdf
    • http://backkwang.com/userData/board/file/47414607291.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/463e2ccfbb29bf8ef2dd6d272ea602cd/bazakilexalitudoteninu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca202dfa55---tugitivegekewarirob.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c57c3f17d42ca26987f0fb872c91287e/xutekufetorejenegelu.pdf
    • http://adaviestransportltd.com/userfiles/file/texapezo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12df9e598a---sizowup.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7952f6c50a---59484847244.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071823c34f63---83121716721.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j4scif6t8dq59mls5gup6uaeij/58053123682.pdf
    • http://industrialdevices.in/uploads/17434768111.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/191b200ba1b6fad8c74e3a1acdd0612e/26472338402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=examples+of+how+energy+is+transferred
    • 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_off0000f313.bin
d26f2999d455f6143bb132de479fbb06dd34ad4d51229aa5f8b89247f251b5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 11228 bytes
font_01_sfnt_off00010d0d.bin
36540139c8d3dcfefe97c5ee229627ec3635e7782754f68cdd5d770c00b7d9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 17436 bytes
font_02_sfnt_off00013aeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 16792 bytes

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