Malicious PDF — malware analysis report

Static analysis result for SHA-256 399dceb30c1a1bf3…

MALICIOUS

PDF

90.1 KB Created: 2021-07-14 05:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75e195e2e51c729532ec6bd6b727b8f0 SHA-1: d3f901f60fc4381114e36fce976a27cca86f12bd SHA-256: 399dceb30c1a1bf36afdf28311610d466518516f836a4312b29951a101b6c470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true destination of these links. While no scripts were directly extracted, the presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3850

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://medvor.ru/uplcv?utm_term=charlize+theron+megyn+kelly PDF link annotation
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukusamowimebezipuwegeso.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/82103977777.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088584d6e78d---raratepedidotisevujema.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/pamawuxasisakuwal.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/pazasufumurowe.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/xipumenuxalozofali.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/babajabulizus.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/giwalu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lftags3tmel7mkskbgbhqfk5kr/wuwesawif.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7360e638f---wepidixexifamolerobowi.pdfIn PDF document text
    • http://debden.org/userfiles/file/67280675677.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uhl0q854vv8b05jdfllio06873/mimupikoneb.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5a94a7df---3046712510.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bd5592766039cac7dc7893fd4861bef5/mezeri.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/62pslh0c2mggpau8gp3fjlbcl9/pexogaresorodumoforipeveb.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/linajupovi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6c1efb0cb3f9f545ff5a75d6ac293ca3/nagezimalasuxelizi.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/19822788167.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9be3a7dbb---venanudek.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/daweviwakorunafamitutulab.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/7412756080.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f483d67798---fafewezupuvumesaviwis.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/41cd974a19f15e2df048cad94aeabbbf/63189013605.pdfIn 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_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 10684 bytes
SHA-256: cef319df6b6a7a81ad35d07fa24994fe016779ae23a03bdd13b7207bab80beda
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 18040 bytes
SHA-256: 04fc878a5d00f3628cb3f781210d5ef9f9b94076b8658d83b8b72a92e25b046b