Malicious PDF — malware analysis report

Static analysis result for SHA-256 8badf4566b7cacb2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 09:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0892e4fa1e85fe70dca1309bab4438da SHA-1: 3e188de448db54b4452ace134cb91ecec5734c0c SHA-256: 8badf4566b7cacb2206192476026b00ca8d55f80579dbe2222ca3aa3b7b941db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. The presence of multiple external URIs and the link farm structure strongly indicate an intent to redirect users to malicious content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2122

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
  • 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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/irvdqhfmp5041la7lfgq09an25/kupenigedujetuxibaruxabi.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13ea1fe5b48d3461ba5c6e67dc40293e/zexagisefafagumoped.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/74063822673.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd1458d89e---lapamagaza.pdfIn PDF document text
    • https://rinducm1.com/contents//files/dazegunegike.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/76771589031.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec62ca7b8---xufasor.pdfIn PDF document text
    • http://landbondcorten.com/attachment/file/3d97357ea7f39f4c77514a25fc61d645.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/34489280317.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/95569738004.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/pafemebibefinoxajevekep.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d1aa68df25---nabinolozowugeteve.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf68ad2d---42641433294.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/dumopusakotelevufenulivo.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210808_105830.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69b89c3d2---32520510001.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/nurerel.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/495126960799699610a2854e992e0e5e/zexifedoridipobax.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/eu2811cq2nmu7vqeljqrodch77/dilagifamupanizejosusuj.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/47108940038.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3oqv6c7qckia1rlo8t3bhc0t94/39847714508.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b6f0851e0b85515a0e157d16cae8044f/jukafotewumomax.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b15bf578---dujomupakazifezaxotedo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/37017928931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=beat+about+the+bush+meaning+in+englishPDF 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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10748 bytes
SHA-256: 6105dd0457e4eebd19cf384439c1fb3abec57cfec783ece07ba3ba7b7f0c4417
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 23108 bytes
SHA-256: 8237848493f33457cc46419eac9ca72677efcc8d64ae32babafac2ec8558e9aa

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