Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe06d4b9da983b3…

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 07:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91472c5d4da323a220c48896ff56f098 SHA-1: bacc0eceb7ed8da695db290ba6c4604cc045fe1e SHA-256: cfe06d4b9da983b34840e4bf6d7e7a49de18e6c6026e03e509b858afccad698f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of link farms on compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6805628ee6---80412663914.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074413d2df05---20784408747.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bavufazalu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c80b40bfbfbd1372fdc29d4b5985f81a/xonuxudajomu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8321582e2---52787312379.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/95348126509.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/s5ooqtmd8b3nm3ko0hukjc36v8/jijawemawulelefosoruto.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b28fdc1f0---79952969873.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/55e7400e6d0dc33418f5625a9bc9bf85/72048868033.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ltiffhikvuhcfqqddo7p4qqh06/rimiwatudevarapar.pdfIn PDF document text
    • https://luminex.pl/upload/file/63632482331.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c0858f45---84810499635.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/zegevididojopudopag.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/72978be554ef57b35fa809d133394177/jetunolozimubuwupezox.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0b7bd9b3e7068a074287bb9804d9c0bb/wiwogo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646226ed3c---teginig.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86221799200.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qlbmvs2i0sme71iafj8s4klbvr/42799665545.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lelizijidijukipanevesixa.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/vukujovisavemizugu.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/pibefewafurafixe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a2f1f884---pixidoxu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/iipddjp1mh8a7da42k2ud9mogs/81539167285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tabby+mctat+book+pdf+free+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/73887142641.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 25552 bytes
SHA-256: 9af39dbc5074e1181a35abbc9e675ae1739837cbe663d1b98c14129989722370
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10916 bytes
SHA-256: 3ed0eacb5b1ae3301ebc2d12714ada5f1a0d97611c3b8d9fedf0594c527df194