Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d57b34c438d65fc…

MALICIOUS

PDF

73.7 KB Created: 2021-07-06 06:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ac38367732070f088939e241bf9845d SHA-1: 8bf4917cf35ac40e8bb7f9487be9aa01c63800b1 SHA-256: 7d57b34c438d65fc2c6e0cb93dbd04870459eb50b5705181cc336a4294489b47
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.awakohchang.com/image/upload/File/795435909.pdf In PDF document text
    • http://castrolmintabolt.hu/images/upload/file/17613001953.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/4250981252.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705e6f924c9---furatipavu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/75554980555.pdfIn PDF document text
    • https://x-software.cz/data/file/mojukikuxevepiwixowaso.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1e1f35011fea41d496b9e1888a617939/83020136286.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/tribhmtg1bd86nepv5uqdokruq/22007517109.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/sipijuzulewu.pdfIn PDF document text
    • http://devison-matras.com/upload/file/71813655606.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/47614017373.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/58286321201.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/modavatizefaxeweped.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051020465988.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/48e0d4612eb93f08ccc53371ced159f5/12207277491.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/gbgm479b75ovdttsuij634qmt2/nafaxedipudesumevekagisux.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54891306222.pdfIn PDF document text
    • http://mesterek.net/tmp/49912473698.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6dcf30a0---jopagagekoxuko.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1265d6d6---sinorivofibizipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pret+a+manger+food+on+the+move+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 17292 bytes
SHA-256: 3c28d5a86b4b03df4cb660616f50abecbaae8eac77e110050c2b5d407a0c98af
font_01_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10708 bytes
SHA-256: 4ad39cc0c09e23fe262e45487c361797746fd575e5493d36ad3b93f9eb055f6d