Malicious PDF — malware analysis report

Static analysis result for SHA-256 148d8c71c738049b…

MALICIOUS

PDF

109.6 KB Created: 2021-08-18 05:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6dfe09c4f32124b534f90d4e9d06e13 SHA-1: 7202555ebc1a95972aa391ff9a3b1cf970b82ddb SHA-256: 148d8c71c738049b587a0ce621012419dd87b36951687021b032e4df5ff62226
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host and distribute further malicious content. The presence of multiple PDF files hosted on these compromised sites indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be1913a4a0c---nazij.pdf In PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/44797cb82bad6963655a90e31bacf6b7/vijedeb.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/778cb3511f6e5746d925aa2023e3e736/puzotiderobinuj.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/57f81d0e90e02797d7ea0fb1bf07d281/lofolemijasovagoliri.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/japazasurusuriwen.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/lefanavokoworokofelamob.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de9096e6c---84732655898.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161096528d1c03---jopapirep.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a308eff1---64202913300.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5cbcauubfr0b8qjqi0q8afac02/79123766119.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/lomuwojekule.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3588e16902---metezufusidufi.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/17936998572.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/97665198269.pdfIn PDF document text
    • http://ud2-140.com/files/gawutuzivusiz.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/favalozuterumunubufubizo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/14535373711.pdfIn PDF document text
    • https://parkettworld.com/upload/files/55859121552.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b0bcdfbc8aeb0dee075d0a25fb877f9a/galizi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29856c68f0cb11edbfd57742c3c3d2a5/59981784127.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086681aca771---82456326573.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/7060737245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+theory+of+everything+full+movie+in+hindi+filmymeetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 10716 bytes
SHA-256: 7a061d934b900bc99726ec843b2fb358b0223be267e76387cc1faedfef169194
font_01_sfnt_off000153db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DB 18292 bytes
SHA-256: 077ed7a68265f5faaea3a0ea7e4110cf1c640e3c7f8462004b83c3d05785c91c
font_02_sfnt_off00018433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18433 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off000199a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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