Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f698e98585bcc95…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 16:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccbb1bce03cfd272951b1da1dc2b06c4 SHA-1: 9b580748c505d2cfe7684276701c3253b38ca570 SHA-256: 7f698e98585bcc955862d7bd9b31639c2ec0ee8f81064535af3dfab2b3ee6d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or downloads. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.sistemkabin.com/ckfinder/userfiles/files/pamabaduwipavi.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef74cbc2e9---62403658534.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/12339608975.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/94241ca8c22665d6cf8df899e66501d4/wajejuvosuvo.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/36469459124.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31750605653.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/32963302349.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/32475935617.pdfIn PDF document text
    • https://fasaac.org/temp/files/87246511387.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/66278105327.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3237276423b3fd08a11722a79634a148/14655310808.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d894f4067---38960741916.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/saganabuzevonodajirure.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/45207972441.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/xojetuzodukije.pdfIn PDF document text
    • http://rivucota.com/upload/files/84881366875.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/65013310149.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/kezobefox.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/31848695702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wps+wpa+mod+apk+downloadPDF 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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10300 bytes
SHA-256: c1c336c46b601f60eabf511343e55220af31034cccad1a19a94314cedf0b0a1d
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 17504 bytes
SHA-256: 8cf9ee89fffc2e1ca30fe0b1e3e3cb4bb2c4150d88f8d6f32720a5d44779763e
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1