Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9458d1e0f531a24…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 12:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1b652d97130e528b697446b9b32a02e SHA-1: 182d23cae9761218fa6c6b40b978c2cb2150c243 SHA-256: c9458d1e0f531a24a4acabad26dd33e0f800a160db8f2a13ade35093fc43d40c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://recko.ru/ckfinder/userfiles/files/35691202782.pdf In PDF document text
    • https://ud-hobby.com/images/Upload/file/53335759241.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/susul.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/63370952267.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/87874341943.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210912_750F40A971075427.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/29101937809.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161321a83ece2e---koxerozeluzajufe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6083e10d---30795873373.pdfIn PDF document text
    • http://logicamail.it/draft/media/2353254768.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • https://rubfila.in/files/file/wejavigofawunamujiso.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/47045494758.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/3289941172.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/suramepobomixonetitu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gunolidatewuralebu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mafek.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/39553051509.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/bukisinajotaputaxexe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/boduwik.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e22777b4---tifajo.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/xawiw.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/buzepemasakirufomosovoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mechanical+aptitude+questions+and+answers+pdfPDF 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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 17844 bytes
SHA-256: 4eda89fd9bd24ad4342d49976e12efaecf6c3dd8c128c53e8337c308f7375d8f
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11044 bytes
SHA-256: dd7340f4983e441781944bfe34fe8a6c6e98c4a43340af841c99e79d6d412542
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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