Malicious PDF — malware analysis report

Static analysis result for SHA-256 438f47b9130d5fcc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 10:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 850807ae30a3d44f5cf2554906f1fb6d SHA-1: f4ca5ffc62b9586b200cfdac5376058d48880430 SHA-256: 438f47b9130d5fccc3ec88b02189b339663518d675c27b8d5de21e4afb053397
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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://dichocungtoi.com/userfiles/file/pewujudosabazevadu.pdf In PDF document text
    • http://esejsc.com/upload/files/sururizutowapojo.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/kewabodibaxikaxopamojusu.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/pikirizu.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/99326739633.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/34444437965.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/48139406964.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunirekusizej.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/funulawol.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/rilimibilemurimulukajaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tfoeqjbkagtbs2otridl55k4um/79816947703.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d5434f266411840a7a97ace93cbfc07/8038475385.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/baseditavipe.pdfIn PDF document text
    • http://suurelepa.ee/data/file/radokuvanarofewonozaj.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5639301da0ee2409abdc106bd43ef4f6/37760156684.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/17/solet.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/3848169506.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0b241jihf0cmesdgkabtie6k3/27172488492.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210714121633_ahz2r9.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddab6eb3f73---rugurig.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/1289600482.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/57013366190.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7584939985321c0b734daae9b6cd9f25/26962755862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=attestation+d%27h%C3%A9bergement+pdf+cafPDF 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 20220 bytes
SHA-256: 8208e8caed01233de5ebbea20fb4cbf6e63b39846bce2556a000ef9b6b45a449
font_01_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 11328 bytes
SHA-256: 931640cc24d4bbfb75768bd5117fead33300ba8063819fbe0b5bf96ed2b760db