Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f717013aaa1f2fe…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 10:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebc5b8fcc56ad04a7b033a60284b9c19 SHA-1: 374b111ae71b962256e08f1fde0b443d99022470 SHA-256: 3f717013aaa1f2fe977cc6a52265ba700a3ffc99d7383367919001357134eb47
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to manipulate search engine rankings or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/38645018991.pdf In PDF document text
    • http://agisinfo.ru/uploads/content/files/75636360549.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wifijexikukab.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/27449345574.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9ccd1ddf---5075065452.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/48213949546.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/77315905140.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/12025730044.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/38979177257.pdfIn PDF document text
    • https://micsys.in/userfiles/file/dinubivas.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lekedevunu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/161e6a47316aaa765cead61df0f7827f/10944186144.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/xafuk.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/mogozukenazebafe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfd7eb33e---numib.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/48074859192.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/65515049966.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/65758763499.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dozikojaj.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jisolovepotupadu.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/79324944066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+free+android+calculatorPDF link annotation
    • 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10624 bytes
SHA-256: 1abd49f13749c91e6c9f752ef492d3142716a4c7f75a9805ddfc080ab881eb72
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 17660 bytes
SHA-256: 7fe0909d363857dd0ffef46fe477ba817f55eaef8278109903689fc5a0a1146a

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