Malicious PDF — malware analysis report

Static analysis result for SHA-256 73902671bf53c6d0…

MALICIOUS

PDF

80.4 KB Created: 2021-08-19 21:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5152f6701297e3c8682f8e118b33d430 SHA-1: 10765d39a3e713003036e6b9c3319277c2784c2c SHA-256: 73902671bf53c6d0ec72b2fa5f30e3604a73d2df34ee36cd0dafab91d73dc30d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall PDF structure point towards an attempt to redirect users to malicious content, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9543

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 http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/39a0da53bb9a232cff0c67daddcd5fc5/43930523143.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985380a62---xufanajarosefekikulome.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunudede.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/uul25j97ljacad0hsv99psmcl3/14258666898.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e9d62127b---folamodewinodafat.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/wezujavipevakotetuvef.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/75jrpctmr1l2ov1abfmuub98cl/waful.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/simimopoperodatamaka.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/q9j5a71hjmcat13ftst235qd81/86234540656.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/25578856280.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/687bc415010306f41a21af706f29ce5b/98253089965.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/5944784204.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gcmt8upqu5u8511dv3a3vjg9c/58635469433.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2277604ccc25b89038cc2a04a0a383ba/juwuximu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c18da3065---30749348627.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/vozebaraporek.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/46625136579.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mijirawoponovajij.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/64663013382.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/63405254225.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/18253128544.pdfIn PDF document text
    • http://24cvety.ru/upload/files/97109072448.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/subotodud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+resueltos+de+energia+mecanica+monta%C3%B1a+rusaPDF 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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 18248 bytes
SHA-256: dec6865f1714c36bd06ae9e0c95256ec79bc1688370064d70dbff23ffc4f7f7a
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 11132 bytes
SHA-256: f8f0f16e5e2f90bbc401a032642339c9a6ebb41c62ba3f37c4c9e9693b9d95ee
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.