Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cef8083e4b0aac…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 08:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b591909d4420a9a95de6eace622c366 SHA-1: 076783f35e4223ab3bde470f757703b80ca17346 SHA-256: 67cef8083e4b0aac34749baecb84c9c11e1a8972c47eaa55ccae1f4947862e29
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=2nas+android+flash+tools PDF link annotation
    • http://cp-1.ru/userfiles/files/pujapulapabupigofep.pdfIn PDF document text
    • http://zuche0551.com/upload/file/15994202001.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b2a2ed50---fumuwaguzavebof.pdfIn PDF document text
    • http://w-mill.jp/images/file/wiwexamovudivelexifigure.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96236904202.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/buvidewu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/fomupowalofozotuvalam.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/66898589023.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/girijujakunenulaj.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/33293405982.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/85017120426.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://partiaweb.com/upload/files/zuzuzokaxirudibaduxuwaju.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/velewiv.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/wemilasuj.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/36815185887.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109180554311117.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5081864a98c237d8b05ef4e8b590eb64/ripojizuxu.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/novobevetusolidajij.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/1276110851.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/juberiwovarebide.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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16352 bytes
SHA-256: 960e43f5404835fb9b4ea20811c4f05e5a797b8248977eb66785ebd713e3b4e5
font_02_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 10344 bytes
SHA-256: 4945eaffc6d95ffc456ffe59e7a2da6a8b4771d0f5770367649bc842e1943e4e