Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bcb1cbbd2b5e4e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 14:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 40a89d5fe08eb38342fd52f4c7979da4 SHA-1: d81d3270b6ff776cfdfe5e992b7e6e3ca3e52881 SHA-256: 83bcb1cbbd2b5e4ef76d2d14811fd755955d5a90a0abfbd99562583e5405e0fd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or compromised hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6493

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
  • 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://queure.ru/uplcv?utm_term=create+bootable+usb+using+android PDF link annotation
    • http://tiszaikaland.hu/upload/file/85607009543.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/lepavorikof.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/difevapunibutazena.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/digumuvatadud.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/5714311368.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/basesaba.pdfIn PDF document text
    • http://brenderup.ro/mm/file/38714602726.pdfIn PDF document text
    • http://strandedtattoo.com/file/5442591514.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/mezotegir.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0fic83nsbev2jjopsbuv9o1f2a/75765375904.pdfIn PDF document text
    • http://czyxchem.com/upload/files/tutagovamofidisezaximuxuf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135035ed7c6e---67423322892.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/peresokupemunow.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/damodinizi.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/kikafujevuxuzavedamore.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/70224308186.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/43812748130.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b477b0bf4020e5ff68d2c78374334141/ketukoratoraxuvekudow.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5d0097c812e536bd07e5c85e212bc983/30363158058.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xusamumiwubago.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b71db2a7d00192a1bbcf149b835e33cf/14195708266.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gisatafasavuwiweb.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16150448c6c48b---31227334568.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150809829151---bugelulowakuxova.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_off0000b4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AC 17532 bytes
SHA-256: 522dc505d93fbfd595a825f1ddd120c30ff06cf757b0b37e3e58d599807da7a2
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 10696 bytes
SHA-256: 5e67a2d75ea008074b3bb47784e16803b9aa9d36491e3438a9144dcdd6224d2c
font_02_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1