Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacd73e5db1cb013…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 07:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a34be106799c75e35ccfe070fffeb9f2 SHA-1: 58df2e4465fa33c9a500ceff1c79cfcc72dc7d05 SHA-256: cacd73e5db1cb013dbc30f212bfde2c2f7c30e71082fb6d268079c1b3de4cc6f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms. The primary attack pattern involves luring users to these external sites, likely for further exploitation or credential harvesting.

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 https://samtee.com/admin/images/file/fukubozotuzonipexifudap.pdf
    • http://capmar.eu/userfiles/file/75642936449.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9d43b287---lijirevawamepe.pdf
    • http://tamker.hu/userfiles/file/gitavuvokitubilepusovotom.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073dca02baf3---45553214080.pdf
    • http://onlineexpert.in/userfiles/file/zavovenedokutenodosex.pdf
    • http://faw-asia.com/image/upload/files/71752824809.pdf
    • http://cdmatik.com/uploads/file/83666614863.pdf
    • http://jar-ted.pl/file/besivikiripu.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fc6befa9cb2ebeead6dc09239a3a6e0/64469637924.pdf
    • http://lapenya.cat/imgjovesnaves/file/19954199920.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/08934f5fa2710f9606cd37f9c80cacc5/22164236318.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607022237f59c---90949325538.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c334f7b10c3---85502386382.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607735e7dd236---36082926840.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dqcf5vkqj6eg8bsl02egkk3vo2/64460991561.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33a6a8842---3533206734.pdf
    • http://bezagsecurity.cz/userfiles/8842287332.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25dd797454---39230464882.pdf
    • http://vtaky.sk/media/file/piwasuzolapegukenusanilo.pdf
    • https://zivotzaokny.eu/res/file/kesopekadimemig.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ee1l9bhke99o8vspu6lit74qhc/8872185337.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fe45389f---23533612389.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c1494676e09---zofirimegilowaxujibinowa.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece1721623---toguvipedototanolak.pdf
    • https://aduanaldelvalle.com/userfiles/file/joxipazogipexorobu.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/wajuza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+offsides+in+hockey
    • 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_off0000f2c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
font_01_sfnt_off00010ada.bin
bf1506e2451281820e71ff46a04df460798a9e636527d9e927a8014fa4abdba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16988 bytes
font_02_sfnt_off00013720.bin
e7b107c79845fe17cff6fd4780aef84b87b0e15f5960622c7bf0ae0ae9f23e61
pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 10628 bytes