Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de52795dd4746f5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 00:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80290a2cc9387c2a7b8e783eaf4b5f09 SHA-1: 412d036d7c313980827baab470af856adccb1b91 SHA-256: 7de52795dd4746f519153865a8ade92715ef1374242f955079d7277863800b4b
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, some of which are hosted on compromised CMS uploads. The presence of 'SE_QR_LURE' and 'SE_DOWNLOAD_BUTTON' heuristics suggests a social engineering attempt to trick users into clicking links or scanning QR codes. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://capmar.eu/userfiles/file/55928110770.pdf In PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/15509118177.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/529932251613719a37cddd.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/53892128055.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/valonerupizuzasida.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jisibumadawonodabakij.pdfIn PDF document text
    • http://schokofontaenen.de/idata/84237153597.pdfIn PDF document text
    • http://tencanpowder.com/d/files/kukufakuliseropejo.pdfIn PDF document text
    • http://dhf-china.com/d/files/lijuredudagobadogizobu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabeab46fb---soxeravakozited.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/85656427155.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/81879671650.pdfIn PDF document text
    • http://onlinevay.com/upload/files/63899625748.pdfIn PDF document text
    • https://andrejc.si/files/file/nobejaritebesosivimudazor.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/tovexedagi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7acc3265f---83695552948.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e5e8766---butamoxev.pdfIn PDF document text
    • http://dejede.com/userfiles/file/92682363845.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/naxapobamidavezifola.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/47761483059.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/59583014320.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/wozikepiranowefefedija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+app+apk+old+versionPDF link annotation
    • 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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 19232 bytes
SHA-256: 500065520b81432c165b2028129435b99f603c74b77069125898e810ae8caeb8
font_01_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10680 bytes
SHA-256: 52d83236098242d477ef383eba9b807679ad03b084a5530b4aa32297ba88f559

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