Malicious PDF — malware analysis report

Static analysis result for SHA-256 c290527c71c74d19…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 01:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a5c4bdc08066965c02e90651c21aef7 SHA-1: cd3180fb239b0ef506e315d26b4efde4ecbef36a SHA-256: c290527c71c74d196504de181baab931fc0e747626ea673f5126cff6b99199de
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=formula+for+the+sum+of+arithmetic+progression PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353210afaf4---14487376271.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/81653080209.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2169dd97df4ee22a51128fe30cce6d69/93380197203.pdfIn PDF document text
    • http://redactron.com/userfiles/file/25547915024.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/69422049345.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/57010383105.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/rokufojevepenoperofiripak.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/luvukusuzumowujutesoza.pdfPDF link annotation
    • http://bibliotekaszamocin.pl/img/upload/files/jokojilagotumokofe.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/70012489014.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/bowojunesijazek.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_161755.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4da63a69---tuvuwowemijofevadudafe.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/83393230953.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/xebifalukizutal.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/zoduw.pdfIn PDF document text
    • http://gooselatex.com/userfiles/file/73554574614.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210909_015132_191.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/54954922611.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/jowifivalixufinar.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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 18920 bytes
SHA-256: 716295523b9dc3d8d4fd2e80ef0ce807701c1e61143061e0efdf3adbc785e7a8
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11004 bytes
SHA-256: 39b63259fbefc698796ff8962d01bc201801c1d7e10841c0411e461e91cb0949
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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