Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc31a783fa0eec2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 19:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b23f0b0c5d90498550415156fadc9669 SHA-1: 3b30cd4338fa831cc7098bc8e7005ae7ac062740 SHA-256: dcc31a783fa0eec26f87bdee5681b5eb82211c074c96a8755b06afeaece68544
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing pages. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crysiq.ru/uplcv?utm_term=aimbot+on+roblox+arsenal PDF link annotation
    • http://quimis.net/js/ckfinder/userfiles/files/46843684387.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/41778500481.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b2d7e81---88203993213.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/41792558191.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/gebovebojib.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/37580748744.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144501c912e5---mubofapijofi.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/ligujuwekoga.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/60605710572.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/82596853553.pdfIn PDF document text
    • http://cudicio.it/images/file/56292063532.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/32218983364.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87820601029.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kupitekolexoxo.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908142904.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/52150099158.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/busilewifivuropisolegugi.pdfIn PDF document text
    • https://strechybenesov.cz/content/8393995045.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/nolafewazatedibot.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141095c8e02e---7274894491.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/92690270490.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecef6681ea---goxiwirus.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/70702313599.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/61770892912.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/rafazilobedogokepunewaro.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/tusuvi.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/85550287554.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_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 17952 bytes
SHA-256: c319dbb3f04a4f082eeb4e848b15fd7b785f294aa3ff3276c098bdbc14ba2600
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10492 bytes
SHA-256: 92a7e2df1b4341588f83cf7ce916b98127c25f051567a6b46ab16ba9c99980e1

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