Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c6c1f3b82deaa0…

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 01:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 003bd96e788e8ff6cdddca453dc29e87 SHA-1: a585ce8d4754321118adc7c01853b287f2eb9172 SHA-256: a8c6c1f3b82deaa0137cd871c22bb9c952ef515ae19549029bb4d2d4b52410e4
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to lead users to malicious content or phishing sites. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=risk+mapping+pdf PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/solefilolarurotu.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/jutidizixozasufuvixusu.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sexusejojipigisukixuweral.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/61573021964.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/69124135131.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/67755075522.pdfIn PDF document text
    • http://thaide.org/userfiles/file/66597922041.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4906c6c6---88800856632.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/woxojapafej.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/63473115031.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/desagukoxibavuletabopak.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51793353663.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qfmcs2gu84jgc76vd7mr97cn5b/18223586734.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/77518275588.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47d0b09dc---jokebenajomemakojolibujan.pdfIn PDF document text
    • http://grupophi.es/uploads/files/52359912247.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/543321de4fdddbec56bbe64b0b022493/45955722144.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/ferufuxifirarazuj.pdfIn PDF document text
    • http://turatabor.hu/media/18235333084.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d3ce60a08be43833716c3f09b3c7e387/zeloke.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/25418163844.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9553479a76---35999990513.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160848e15897e3---78041744411.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 17604 bytes
SHA-256: f210cf46de3383c52d3658f6cd5de6d1cef377c64d5f599fb8bd0ef881f5a82a
font_01_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 10480 bytes
SHA-256: 786594b616140857839757921a3ff7d4b043ffe956aa80b8649b4a1bdaa9b08d
font_02_sfnt_off00014b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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