Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6f01239debd661…

MALICIOUS

PDF

95.6 KB Created: 2021-07-04 16:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b36afd62e40a3af311876c3d2a47ccf SHA-1: 23b6b60a4ce74f0cb6234b83b02e66be386face2 SHA-256: 9f6f01239debd66183c5a4cfc74b1afcd4c1d01f664ef8a9d44d6d95543a5db5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/575ef6b0a3c8e266c182f0152acc01c3/gepokib.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f10e1df6314d70005d4c8d7109f2b528/14780903152.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/fa47398866b6323cdcd72d2f8919a0e5/10548522264.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nugin.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ee70169e1c9d19ad9c7c1f3016e50abb/metiguzifozu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/19a11b006179d2a6c60f6ad1164b9745/magugi.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/11845356036.pdfIn PDF document text
    • https://go2germany.ru/files/file/32382663725.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a781d8e44c8---kedexok.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ad097997---gegevevix.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eb1fff3c91e8032600be588e18c5f064/85401445024.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pevekifotisadogabakosanuw.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/6584075234.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/23506772064.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45328815624.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e427e0757c---62179675278.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd222837bd---niwegopivewowemukozikifej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070017c70915---vamurawofoloxalur.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8ffbc7c5e8850e62d1a2f6b4bd4d3a73/79225484458.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a34f7484eb3bb6c58336c21cf889150c/19566562047.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d72118bb---93678623092.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160895e49f4183---50500812025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=me+either+vs+me+tooPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10120 bytes
SHA-256: 6838969ff3a1beeec3e9e9da695716d118b8c4dfe6a595f1a1fdbf0630e00d62
font_01_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 17720 bytes
SHA-256: 5583e0ce0832bef10ef38832496ba7b04f062593e2b35cf009fcca6751e77f08
font_03_sfnt_off00015795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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