Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb5b68f710ad14e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 16:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5841035b4e7d2fdefe9033c2461e7f9a SHA-1: 139c0a41bdc19661c04a13e53b2fffcfedf77692 SHA-256: 5fb5b68f710ad14e80367a9876b19d434c597718b0012e051a76284f226945fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript, though not directly visible in the DOC BODY, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://terezmisszio.eu/files/file/wezeruso.pdf In PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/lafenasi.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/felekiberamojumes.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/venoxofulul.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210624130712.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g0a12k8l3jn3hd87t236vo4537/wufala.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/og1jl24vsrqk07ihrv9d4udnsf/44256895402.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/53430824270.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/44117550404.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/32350311701.pdfIn PDF document text
    • https://efnnma.org/files/file/fefepe.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/fizafubato.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/37865676141.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4d80279adf83bba6132116222cd27ebc/tebeviwofodefodidifaf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5cf61dbd6dd6b5f917aef7464f31101d/refegomegasuvazefo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1dd6bfba---57126291400.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lfkcbm72gef5des4tju6srb9bi/75667384686.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/vowedomerufegef.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/27982382762.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/723749d5fa0fcae63bcf3899066c68d6/nemajisak.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/82770037129.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281b687646---99974804715.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080d870d443e---15637776506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tapping+tools+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17660 bytes
SHA-256: d795ef56cbeb6b7f565198b418c4f295186ad6cf69f9fc3a0076563ab5b9321d
font_01_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 10404 bytes
SHA-256: eded3aa58a260809f2bf2fe1048a64170a4df2553719b6933a150aee03721655

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