Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a899759612f097…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 22:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9f9f81d0662fbfb93bbdca110404c1f SHA-1: 78c8ee216ff1197d772244bdeae65091b82075bb SHA-256: 50a899759612f097b0c6a35c2e41c740f545634d904daa085f4f652a84cccdd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm intended to direct users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=3d+live+wallpaper+for+pc+windows+7+free+download PDF link annotation
    • http://bibliotekaszamocin.pl/img/upload/files/manujulevodaravigubufuvi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c566f0df57---75876872051.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/72008561051.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/52794649307.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79803029981.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nukukazuwozidukovimor.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/93032720975.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/nexaxevujunun.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n6cuejv4082ppjrob2seq9aa2i/93768539630.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/90879320356.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/vafixitasavanajo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090313571373499.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/17733032481.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/23417993009.pdfIn PDF document text
    • https://aspirans.com/files/file/67062533368.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/zavuzakirutojozivuk.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907092928.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pujogu.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/13257907364.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/putedaxadubezad.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab344cf189---91267873185.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/bodogejujejej.pdfIn PDF document text
    • 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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 16640 bytes
SHA-256: a00e4a152e85b69b13936f0b976123e83122ab34482382445c9af09a70894ab8
font_02_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10792 bytes
SHA-256: 1b6c54ba9093d943b7c86cfed909c9f8ed11a2053b208e5ce8c3037e755c61cd