Malicious PDF — malware analysis report

Static analysis result for SHA-256 4794eb5f59eddcdb…

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 19:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e83619b2f840ae3854d0712004371eb SHA-1: 317269a1c6712288a2364ecbdd3356e6a1a7fa86 SHA-256: 4794eb5f59eddcdb3c29f976f51fc4d8352b2344906b6cb6ac82b17adf509b5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://compufoxmail.com/userfiles/file/64272981528.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed8b84450045873cb31da48f9890fb68/66187234704.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2pponehhe7vm5sq5l31oa7ag9d/resexaja.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/tolenevafabazonem.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/884da9f8e29c466f5d84fd2506032e22/66997162076.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/63861629101.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2q2gtlvn5504mnr3i0goahea90/63442491302.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/kutidijorazujeb.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0a8bb25e985c5f267d34812e13c370c1/rulijiginesagedino.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a3f238e---94539194392.pdfIn PDF document text
    • http://stylekd.ru/files/nuralawofapivaviboxi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4b68bcbc6d1e2185f2de828bb32185b9/17466764812.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/xapapeva.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d604197bd1---wubenikovibanoxese.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/37868624482.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8269eddb1a---16901838624.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/84926200170.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/gonipirisurikojot.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dsmomsuoescp5g1rq7m4gp4161/kukimazun.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/mavutusima.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/sapamitudev.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee8bf141b---65779446538.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/34eedd3e1a8532f544c74e8dce848ae0/kebapimasigak.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/78052280812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=round+midnight+pdf+real+bookPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 16888 bytes
SHA-256: de52f6a13cc68b817cb8563d3e5b38da3b431593b86f9a5b8e62fffed237cb65
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 11156 bytes
SHA-256: 0b9e5854497876e8a4c6ecd9af3a3372fdfff5a19a639390d0a8cbd744c04503
font_02_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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