Malicious PDF — malware analysis report

Static analysis result for SHA-256 698ca5c90e255283…

MALICIOUS

PDF

71.9 KB Created: 2021-10-07 09:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 59f5dc95452a03d87fe6116bf27dbc56 SHA-1: 83ba80a8485d216d1a06d812bdf8a740bcd1de44 SHA-256: 698ca5c90e2552833d6cc678df81008f8b162f6697e09a8a28f353f0f378a5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, which flagged it as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://diamant-x.sk/UserFiles/file/begelibojalibanimowi.pdf In PDF document text
    • http://realcomfort.ru/content/upload/file/60513521945.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/87860697033.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fetusojef.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zomasuzuzotivepem.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/40867887218.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210927173639.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/72139512795.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2a88cdf1e---ribobuzojaduvovawaviw.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zinidikelaxutez.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/10138321885.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/mipijebonelinedaliz.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zawadiwugibugijejepo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/zawidojubijemepexirabo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614922ede1c94---valugewivozinevifiro.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/87621424143.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210904_14C7E62444C6393C.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/javizerufexesele.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/duloso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161324e8d8be84---bafabuvinipum.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/katuvozexesozadivukefosus.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/butedekarifatozarovefa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359fdcc0e79---2958384036.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/27349098644.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29030a369---19483970347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=number+21+in+the+biblePDF 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_off0000bb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB95 15448 bytes
SHA-256: 03cde6187945c2ce051b66bdb8bf8558fb527c869b7682071e0a139156a533c7
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10312 bytes
SHA-256: 97504288c3d78387e07a75dc22cf9df4ea20e58cbe64380392d30a0145555f86

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