Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18b229bcf5752e0…

MALICIOUS

PDF

79.0 KB Created: 2021-08-09 21:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa6e92f51b430d4e1a533a960f3ecfc0 SHA-1: 1555500062e0ddb0aae78dc0920d4131ba3bdc8b SHA-256: a18b229bcf5752e0fcea03ee2fd6763b57abcc785e856c41c1a6a9b612b5a223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9573

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/72ec72c89bf3eb18ff84bb24309dee25/tutinupijisofutezeki.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8885531ba7---dadagu.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/57230156439.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49f0a715d22d93e1bcc0f164f5c0c38b/49044955933.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5df91f893ed047d5e34dcf8acaafed42/17015086058.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/21336535667.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/pepesi.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/ragubomebubidikupanik.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/guwasopevanususuw.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jusitupidomumimanu.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/tegaso.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460fe14a6f---2505154271.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0jhlql3om6ta9urqfk1db0upeq/jukixivonudizujobefafoke.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/reniroso.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/daguvuwu.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vunowofo.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://bafiti.com/sklep/userfiles/file/mivewemavolaz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea97df5b5f2b141573b36a569d006313/vuvijagaxabokatij.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/38601878445.pdfIn PDF document text
    • http://w-mill.jp/images/file/dekojobumekalutuxabote.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f08d38934472f1ff886bd1da827f2fad/rixefizaruluju.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e76e2858b480ae880952d2ea509689e3/98155451492.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0a06bcdc043982fe504e75422efc977/40349281667.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/38674200289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+fill+smok+nord+22PDF 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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 17028 bytes
SHA-256: f09876a3417fda4e581b4a54ea90b9b7861a085a1102390c0980b6c7439ece07
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 10512 bytes
SHA-256: 43f6bb4ef23e7712039da040cb60d376d66a4ecd1ec4b89378963c64afc485c3