Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c60c3f07fa6bb46…

MALICIOUS

PDF

119.5 KB Created: 2021-07-01 19:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 727066f207d859f4d5808761c6a6a892 SHA-1: 734be34316ea421e70d3585efe5002db0a940371 SHA-256: 3c60c3f07fa6bb46539585a8dccf73b3affb322e2276842cbf0d4be2d0d5500d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4aqkhln3ul7hcq0n08cv31oh0/wubipe.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-15/20210615144624639152.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080211cacbcb---manaxapotoparugari.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/52104397195.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/65366616808.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e0ae871abefa91b189ea0781978636c/81466367028.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xezom.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bd63b2b4242055123bb75bd851a8eca4/50047123645.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df5db1360---69434342082.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5945cde451---76429126780.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7328d668---60339975636.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/57909944138.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609270322ba73---nirutexafodoxufake.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/28313927441.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rs7oq5jlb6a8mskitaus88ap37/89999116511.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/275dc11f054a63809739becc6a2158cb/nigokizalatigi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/d23869dmanbnlkc90plj0i56mj/jeburevu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7def7398d291568978339936dfd1f8c7/437664920.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/34108308737.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c448650---41570150326.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/ferevuladi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a45ea6231---fisafibodotese.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ohdbente2uj94f4f7fbltf9snb/noxaletuwav.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gm7u0avhj5nnc2ms4737f2at04/maxidogow.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/3787920552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dosa+house+old+airportPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00014ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE1 17004 bytes
SHA-256: 048c4f19dc0daab5c26df7cf89a12ab10c164d840bb5a773f9717248ba3922ea
font_01_sfnt_off000163ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BA 23320 bytes
SHA-256: c2a8e37ebfba14c3b4564a2db71d4ac6f4e2eea5bee56d71fe7afebd77f4c0be
font_02_sfnt_off0001a02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B843 10484 bytes
SHA-256: e7dbb3be1b734a791a0f77206c44e35f8a1420bef7dd70aa914f73b882b3fe77

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