Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eb721f2b55a90a…

MALICIOUS

PDF

114.7 KB Created: 2021-10-09 01:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9d74837c53e64995882b5df209354711 SHA-1: 82e0d987ccbcef18d082fa036d1f8cbc865cccc0 SHA-256: b3eb721f2b55a90aef919e24abbc943dd1eaf8095453a477d5d1628d99dea543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6186

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://archism.ru/uplcv?utm_term=chilling+adventures+of+sabrina+billy PDF link annotation
    • http://ladyqueen.it/userfiles/files/93802815018.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ff59291134d7bb2058314fa8f393852c/29294415710.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/lopufiketejilovaganorizev.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/fovizes.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161525c1368693---16783764588.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/36920995834.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49553851234.pdfIn PDF document text
    • https://totounited.com/contents/files/titazudusej.pdfIn PDF document text
    • http://suurelepa.ee/data/file/98206331002.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/51597637808.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/waxixekumuz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/5870085388.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/50121740755.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/70364408240.pdfIn PDF document text
    • https://obrbikes.com/files/files/72999917202.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/77562687852.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613279025817b---49402513411.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/4761780448.pdfIn PDF document text
    • http://immopolignano.lu/images/86608394103.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/12296857899.pdfIn PDF document text
    • https://anjingliar.com/contents/files/30201377546.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/85191684795.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/gomojaduwovazuvif.pdfIn PDF document text
    • https://ms01bet.net/contents/files/25198594641.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_off00016561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16561 19796 bytes
SHA-256: ba291fba2a9246b1f051a2e3eacde6b3b2f9213080a49959d12d058484a2950d
font_01_sfnt_off0001984d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1984D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B064 11084 bytes
SHA-256: 4ede739abc3a8ebd3789b727b19c485ebd1eb2c097da1c6c66367e6809b24b1d

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