Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd0859f213107b8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 18:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1df5772462ee01d4b814e370607ecae0 SHA-1: 36c287228cbc06395a509ab6fd8ed2258f4d44a0 SHA-256: dfd0859f213107b8f0917f8e1d131a23c63af2f0bd3284facd005bd90676996c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The presence of a "link farm" heuristic and the ML classifier's high confidence score suggest malicious intent, likely to distribute further malware or phishing content. The ClamAV detection as "Pdf.Phishing.Trojan" strongly supports this assessment. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://artepcb.com/upload/files/59229174569.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/4068826099.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/guzagesazukob.pdfIn PDF document text
    • https://actor-conseil.com/files/file/39679341044.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612477b04c4f6---mibofedeza.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df280289f12---ferawanifipuf.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/ridavidirigilafulinobe.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/mukunadenufetebopom.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608646177377c---48903627597.pdfIn PDF document text
    • http://scsychem.com/upload/files/rukam.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c422d2bee70---10133441812.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c5108279---91756772779.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/68522308038.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c3e3af16---rexunazubofixogugupa.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/nenepixedosigi.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/fakipen.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/pesifakiniwuwe.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/gapuludasenorapuje.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f96b1d7d7f6b69a434c3de322999934/mirajipabex.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kebirazoboneneraxevileje.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7v88po81d47qh3luieo43auf12/91821809387.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/ditosuvawatasamux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=durable+power+of+attorney+pdf+freePDF 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 18264 bytes
SHA-256: 2d426d0161c8cb9620d8b38b14de84fccf4cf6ad9ca9c0be1c8869bd6ef20624
font_02_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 10672 bytes
SHA-256: 9cf047f11932239bee29a9b1c5b50244ef231b5be3909dff5c5646543b4d2fc3

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