Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf0c15a4b209eb7…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 06:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36629adb6f4ad34f5a5452c88a5a4e53 SHA-1: 353270d5b124bfa0dfacdfccbeaeda99fe585181 SHA-256: 7bf0c15a4b209eb7fdbef83897ca8008f6f7506bcea9d083bd69a61c2a730f91
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, many of which are hosted on compromised WordPress installations. The embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=best+8+ball+pool+guideline+tool+apk
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a00be49b9364b900bc21f07b2b0e66a/nipitimukujun.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/714c0b87317726258b36f704f4a056af/65100220018.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/54j7rpih3top0pur1eo65lvlhp/zojilunobipepetazuw.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/k5ojf14kgik7lr9qkji8e04pf3/nofatuwutujo.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/towirosiwevupenuxizudoka.pdf
    • http://www.annaleehuber.com/content_files/file/88592044246.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde9d317c9---dozakitazexolofaxavaz.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609835bb8173d---37530332032.pdf
    • http://e-skala.pl/userfiles/file/73632354922.pdf
    • http://zae.me/datafiles/file/pulub.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc694ffc6---xikapumuje.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbea9e75a0---jeletedunenebatexamaboj.pdf
    • http://myphamlulanjina.com/upload/files/534611721.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160807d5524d78---65735740869.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ioe2pmb04u9vh0m84uiu5etf0/74265376285.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m9qmk0dhs1qcln3eu68inm1304/rotunapijonipo.pdf
    • https://balajitutorial.com/admin/userfiles/file/71934317769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea79.bin
fac01c0ea947c14c58fe30aa803e1cc941857e185b96ff490fc11fab64f924b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 5360 bytes
font_01_sfnt_off0000fcbb.bin
4f0f0ed0f2328cb8d6b4c3a0020e406d978ccdda7d4705ae4f959d652cd8780c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10544 bytes
font_02_sfnt_off0001206a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 4324 bytes

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