Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3c3ad63b87f7a7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74ca787122608b2c23ef6389051d7709 SHA-1: af222f8a7be9c305929fa6a54252e7fb330a3551 SHA-256: 9c3c3ad63b87f7a7f7cb8c108eb97f77991360858a00102a16f103a06d5daf36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=sequence+diagram+for+hotel+management+system+pdf PDF link annotation
    • https://laughteronlineuniversity.com/images/upload/files/xevogile.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081ecb7bd688---49351685529.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/gotufetamevutenidalorusof.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/gitizu.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/todejekigorulukasugu.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/xepejenetuzat.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9537b92c2ba6838fd9d8e59634b04ea2/jufibej.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ad3816e4356b1f28da97b13257a8bda/52643688380.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd57b3b25d---93159141212.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836d5d675---patulegu.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/nibujulonomof.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lefuseg.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/dusagokunitomikitak.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/21059613198.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/30454958102.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/9746308049.pdfIn PDF document text
    • https://petek.biz/resimler/files/fokeroveremelizotukaf.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/24573170939.pdfIn PDF document text
    • http://polipack.ru/content/file/vejosufuzeli.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/17959236481.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd798245c---galugujeluferugawusepemo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/72872426362.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/83046990017.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/xuvuwemajaxiwite.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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 11504 bytes
SHA-256: 744e2f9961b98c25584a7b5d50bd3ff15c2b9ef7e0724d6e7e3c433c83a6c65d
font_02_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16388 bytes
SHA-256: 854dedafafaf8c4b69fcf3a988d066ef3759a3789814584a87e4e295da162a22

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