Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dc9bed264d3f72…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 23:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 850f1fc1410f91fd4164f833d4d2388c SHA-1: 03188bccc712c97e6c22e49f14f1adf9fb79a554 SHA-256: 83dc9bed264d3f7249cc75587cbdeefdace54111a9eeaf638aafb6385436a08a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links form a link farm designed to redirect users to potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=a8+2018+screen+size PDF link annotation
    • http://www.deep2001.com/images/library/File/zawolidebamirazoxuvofidiw.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86437278645.pdfIn PDF document text
    • https://anandalaya.in/resources/file/jejefuviduwom.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/83303408863.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/segamakilaliduwix.pdfIn PDF document text
    • http://akcco.com/userData/board/file/10099594760.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/90752494076.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfa5fdc700---marukodudofikaribuxupemi.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97908202340.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/davedujisu.pdfIn PDF document text
    • https://ottopianos.nl/files/29920301265.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/69542550088.pdfIn PDF document text
    • https://timminsrenovations.ca/file/cEI3nHxenbMHDX7m.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/33738599399.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16148e007a6f09---kupop.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/53683247130.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/tudovovixejitifesemob.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/83934480618.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161366542996a8---ralunebu.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/46813251231.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/17249213932.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/wemix.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/13774797306.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kukebetigibubavuja.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 18692 bytes
SHA-256: bcf344eb1bf63dc2d9f31817345f2a213b61be55dfaaf7071b6849457981f2cd
font_01_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 10340 bytes
SHA-256: d1ecd68cf6d7f97dd45637eca3b5e15ef9e0d0fe0a59c0374901823271c852e1

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