Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffccabdaaf76d5c…

MALICIOUS

PDF

89.9 KB Created: 2021-08-04 02:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 330dd66724291071d5c7f8d8094d38d1 SHA-1: cfa11b1ab981c2e4e1f558d84803c1140bfa37d0 SHA-256: 5ffccabdaaf76d5c21939b96496591512e15ad969214841322f078df5aa437e1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://harrisonsfamilyreunion.com/clients/62911/File/ditixazimolakusak.pdf In PDF document text
    • http://bilmatbasim.com/userfiles/file/dalisasidoluvubiz.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/29024330646.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/doxuzukupalovoxobufotuded.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abdb324557---fivapasomejolinagepu.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/durekamugazevepazusu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/409be21e5360f66427283ef1887dcc30/11298887737.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072606073641.pdfIn PDF document text
    • https://digireg.it/upload/kabazabujuzowi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/gibumenekudavarokagot.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zegupub.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee779641ab---1631279704.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xenerexaragemirawutagi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bc83ca75---91514161983.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/601b2b3d3c8731555e013a1b45bee6c5/164598031.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/monexuv.pdfIn PDF document text
    • http://isvpro.com/custom/files/94225448669.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5484bddcade5ec8fc4cf04a4b4a2543/84736744837.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/531321e69c913875affeadcd595d2df1/12930804854.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc88be8bfa---pakivenikuw.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2681112744a301d27570ea64ad0e5307/fuxojepobajazimekaj.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ef264b42---fanalemapakexa.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021061320202073499.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070665ae72e6---pijumageka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=when%27s+the+next+maze+runner+moviePDF 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_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 17368 bytes
SHA-256: 2582eeb642408a401e2f4fc5819245eac20add8b7e88c9b9d3adf2d96d2b2462
font_01_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 10684 bytes
SHA-256: 8e39d662b723eb0d1f1bc19c686b580567d86f7499fa5f3208b27bedd082591f
font_02_sfnt_off00013fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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