Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b0b1faf5c11b37…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f18f61bcbc0aa2aedaa46a53224209c8 SHA-1: 1dee98dbee0f0fc38e88df6b980e67eeafa821e1 SHA-256: 84b0b1faf5c11b37867adbd2d676742c606592e4c308f6fe4d8708d82de68908
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

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://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607638915d761---23792604492.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce5553456---93188569003.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/puxojifepovuwetaf.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/silutebovoruxu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082306217def---fujomik.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa61f5f355---bomawovivusotatomezuji.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608780391cd92---lumowixeritaxaxoru.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/821e63bffd955c66672f6167eb9da47b/zofarobefelafusaderesok.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bal6b9k92b5eqj56qe51j09vs1/12118025854.pdfIn PDF document text
    • https://mkart.it/uploads/file/27196111860.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/73920442496.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a1cc5824---tevepevavisaseveripuj.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210728_002630.pdfIn PDF document text
    • https://edarky.net/data/file/katifumakofasexiwuvu.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/xamiver.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42196441344.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d6f0d9026f0a23c57932944f0e17caa6/kiripowofilowolopuw.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2bea00eb3fe758bad7f1957e430f8d81/fazuwekemijulexubu.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210801_7F12D4AC1DCA5C19.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3285c7b723329ed64998c70e7d3f4dac/5795603673.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/nosivewonukifukutubefu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u2292dn4g00tntduq4mhbqf11m/27226196278.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f10b7f804a3---wavosuzujukavoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=extraction+of+iron+by+blast+furnace+pdfPDF 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_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 17872 bytes
SHA-256: 3c10bed93a08bed4520514bbcd87365a88fda5cf59e6a83b67904c14dc0da8f5
font_01_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14432 11052 bytes
SHA-256: 19334d75e602ae745002f0c49c7bb02b1cc47bef48a6596e2b249e34237e5460

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