Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0ede1b40449792…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a5b3e28254fd7fca29d7fee4d4c0ae6 SHA-1: 76b49f7d265eb8c2ab44d52c3c502fddbac207c6 SHA-256: 6a0ede1b4044979289f1cf7d1db0abf930d343fa83709102cae979bbe1609256
156 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 storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=az+screen+recorder+no+ads+apk PDF link annotation
    • https://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/7328775309.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/tifusunulanogonug.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/doxajikevezexojupujagu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaebe0d6d---bivinasapenix.pdfIn PDF document text
    • http://vodova51-53.cz/files/74536826243.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210912103611.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mefuzanokivu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dac7277b03---12276918332.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/9446481882.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161326da46e46d---98187225282.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3a9dd50af7da126d6dcbc7523a045ecf/34649461085.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/64445120091.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/61796344092.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/73267921348.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/49944940339.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109180001321158.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/8903482323.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/lufager.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pejumizugemik.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6086d6d7721baf89dadf2d672e22b5f0/90493203519.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFF 10404 bytes
SHA-256: e7d6f2a9a4eb84124ba3d020df5a2080402aaac013ad7b7fbc45a4a2b0583322
font_01_sfnt_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 16136 bytes
SHA-256: 8226e1194416575d4dfb473416c5443f51c99fc023abb92df21ee1a55dfcedc7
font_04_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 21044 bytes
SHA-256: 5a04d08c42d45fcd0d868f58309027c9d1bc8c0bf099ab08776c6650039255d3

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