Malicious PDF — malware analysis report

Static analysis result for SHA-256 956bb2c4d7559093…

MALICIOUS

PDF

98.0 KB Created: 2021-08-01 17:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84e4592d2edc12a17c53eb05aeaf312b SHA-1: 5a5efdeaaba6fdc75a3989fd93a7a72dd77fcc3f SHA-256: 956bb2c4d75590932721be1ccbcb45cadc553b5abd6d17cbbd376462a9067885
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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://dzwigipoznan.pl/userfiles/file/rudiw.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9c26933d5aeaa20b6ffb0e350981c515/73057330525.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09b5f1fe5---kosuzafufevojibo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xativifufibobazufutimuxe.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xojoso.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957e6dbda69---lotiz.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0b63857f48ee5bb9d940f0914887c93e/kifogimunokepagi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nerinekinizufoxiparewolu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pisagex.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/41457768079.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/kefozujazugedi.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/rabaxusasigapesejotu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160983c6550713---50814357327.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/65521989927.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9d4113bd---76295605882.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tapixugefejupibigune.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mexesevixepaxofosifijax.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/molipudabuwaputadafiwa.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78bf3261---dokoderubir.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/q2cd5m1m1sm8459rs4dsokknkk/3882571190.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ba3a4daf00c1f81dfe9dccb60edee5a0/livewoxirivez.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2af662a92---xefetukan.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4f14cb99152354b532808bd34f62c5a6/giruzuz.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/xeximaxisegokolesa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uhec9u923oqgqbe0p6i0lpk6j3/54610388943.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948f3bc16ee---7657933138.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/39760409955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+a+good+score+for+map+testing+6th+gradePDF 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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 17824 bytes
SHA-256: c865f1ce8fb7df6dba15895b648b88b84fd36571d6e67cb41a59e12e67d6e838
font_01_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_02_sfnt_off0001460d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E24 11180 bytes
SHA-256: e00594f1b01ce91237efc5d11bb02222dcbf403100bae65c8e2b4b4f7afe3278

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