Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8e0f776db5ed3…

MALICIOUS

PDF

78.6 KB Created: 2021-07-15 11:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a74b62eb4cdc5b9df6687ef3477e5d3f SHA-1: c05669258bd26f78d9796d322c61cebeefe41bd4 SHA-256: a3c8e0f776db5ed3c733bec8978ea55a1faeed496e4eb58b64a24ea3aa6a8d30
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 or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://activepymes.com/pub/file/naferilepit.pdf In PDF document text
    • http://nhahanghienminh68.com/upload/files/wezuvavetulutati.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/591ecebb90a684954750200d752ed0d9/kijelilolez.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/6957596071.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/51364175852.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8ca85ac0644d3ae930e6ad9050146ae7/xisokinoveg.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/6541939093.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/96070648292.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/18088161849.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d824f847efb---57076609942.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d02ae8917972d283e5ed982c0667083/60363955243.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/91756820613.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gumevimi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/verezizisubewexo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/17446597067.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jerumozapug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9e554ad2f---wutov.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a486588d72e2b2d9722888a36b4b27bb/5432749868.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606193602.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/1985556819.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/zotapigoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=550+g+to+poundsPDF 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_off0000be4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 10296 bytes
SHA-256: ea52e7ca70450938949f042c408a8915009c55dc984244d646dc714fddd4bd09
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 16320 bytes
SHA-256: 9b3d9764712bb98b74cb295a939dc8539c3ad1046821c1f0a943de693283ae91
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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