Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c675ec50592cafe…

MALICIOUS

PDF

83.1 KB Created: 2021-06-27 11:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb62b5bdf1c8cf86cd4a308c1f4f5033 SHA-1: 89e80ee8810e17d19a15259afbac34715d2b6e79 SHA-256: 7c675ec50592cafe89f190e7ead9e3f7cfcd0f101bb3ecc179b30a0da47b8d29
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially compromised CMS upload directories indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7de77ff9---70963950880.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256891abc3---ridusutavawuxedogu.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qcbiv2jrhairoqniqdcf10mq0q/ribuzisukiperofewejez.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/707cc06c923e5c693d002d445e857849/14243590731.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/081b2b51caa8dc7bd1ab3eefc88dcae0/telufegopopozitove.pdf
    • http://mcutech.net/upload/2021/06/file/16242589731679242433.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff6160d949---43112099737.pdf
    • http://azizolace.cz/images/file/kuxupifamotamatel.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805810025fe---bubaxisavon.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e99b4432d17047c4f6252e41b8dd6b38/60636851313.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68dfb7b1f---46385306249.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a7b4207fd3a8edbf26f034771a9cab1d/vedudimelapopuko.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5666390b8---78958998353.pdf
    • http://nktrading.qa/file/files/jofasunawukumekumiwozopod.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf0ac3cdb---97408403764.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbeea90d4---97034089800.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ddcf26e20e27190015b22d3d5ec8c082/gazanujakivividiwivijir.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c570555d1---jojutipizunokanum.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/wezetutomodifarisi.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b6cd3421---66462777161.pdf
    • http://zartmobilia.com/userfiles/file/20210608235620.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608816e6ccccb---levomojegekinexopowakanal.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5aa27f54a---sobige.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+perfect+heresy
    • 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_off0000def3.bin
3156525e015357e5146f3f4b21e16074cff97cdc8de034ac046d7df7872569f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 19628 bytes
font_01_sfnt_off000110bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16792 bytes
font_02_sfnt_off000128d4.bin
5b5c8ff4956daa9da1db887492ecb514d05dde8f43528ee85f4e0c70ce435df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 10132 bytes

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