Malicious PDF — malware analysis report

Static analysis result for SHA-256 a218552dc53e5aa8…

MALICIOUS

PDF

117.5 KB Created: 2021-06-26 05:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3969d3b476bc683eca47c68ba18f45bd SHA-1: 0ccb2e62c030e04f7458a73cbcd6cd2df6001daa SHA-256: a218552dc53e5aa8cb9c4cfb4289a943d6885419051120b79fafceb2559e529e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://catamma.ru/uplcv?utm_term=wow+mists+of+pandaria+servers
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b96219e0e1675451f7469ee6e804eb/sirizijabizirozolumovim.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960545002---makanonofuten.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/18ea935557bcf103c3f5a25b3e5f5206/tepumitavov.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97e81338a---98289586019.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0894327cb17e7ea73b4749da7be1049d/28705783159.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8c11bfa6---wujuk.pdf
    • http://splogservice.ru/content/file/4607042114.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/j5irktroo3vmu0be3re74e1in3/gezipoxufuma.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079362089905---rosevokowedunetiratupuvap.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3621467c48f5e37ef03e1a8611552d35/dotirizodugoziri.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/48682393386.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bf39ab31---90643264348.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da31564a---91532166614.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fb9681566ff207cbd5a934ae986a005c/xarexifusite.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/82982575210.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1a96b8339adbb9109e2f63a39feedd4f/xiroluvew.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5374e2255---78569729567.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3ae3b04c---90361449391.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19ebd14ae---66893207318.pdf
    • http://e-cluny.cz/UserFiles/file/mokixewek.pdf
    • http://frezerovka.by/images/fxeditor/file/vidonokeleberuwanen.pdf
    • http://energo-winstal.pl/userfiles/file/3513860522.pdf
    • https://grup-insaat.com/userfiles/file/kobarinulupozew.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5rs1ev7rrtrt06cheq9rb8uq3/wobeduxironarosugavu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/449011b62c1b11e6f4de739200ea0539/defipakadapajuvujojaral.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f55.bin
a60e0e4db0e9d607c6466080fd395c4a52b1ac42299fa5f93f9058001e3ad354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 10756 bytes
font_01_sfnt_off0001581e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1581E 16792 bytes
font_02_sfnt_off0001702f.bin
c8feb45327395607283ac26ded6d6e1ed44d6ffc20f37fdd0212791fe3b55711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1702F 18068 bytes
font_03_sfnt_off00018c4e.bin
4f97c4d94d42d89a5abeda7181883e5411d5de3c944788adb8010a8d842b3627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4E 22952 bytes

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