Malicious PDF — malware analysis report

Static analysis result for SHA-256 250c6509d93c5b65…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 02:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cde5533cbd15bd27e35e9c7ce3a95d5 SHA-1: 7875849d03fa97bd7698fcc88d7c5e85648909b8 SHA-256: 250c6509d93c5b6548cb77ee39b98c52a8b00a4f92a3a8af8a3709726cee3fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content or downloads. The presence of a link farm on disposable hosting further supports a phishing or distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://crysiq.ru/uplcv?utm_term=bhool+bhulaiyaa+full+movie+download+mp4+hd PDF link annotation
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfbbad72a---kixubetobudamisig.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905164829.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/21090407242463856161ro9.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dekano.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5ab48b8e---getuteviginufe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/30417877241.pdfIn PDF document text
    • https://hojoairport.com/images/file/vigidavagowubugurer.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wazigofi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kutasivas.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/3642428102.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091105195895.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/zogasasolenamixedidu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/gigasejunutu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/namuka.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dujikelusubegol.pdfIn PDF document text
    • http://mylodge-naoshima.com/xepozokesomexeziganuj.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mokovujonowuvavawini.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kiboxixifitu.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/98578357674.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/soxizuxoginivu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/fogaxap.pdfIn PDF document text
    • http://grandfiltr.com/files/file/52346163487.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6d80691e---nogizixomu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/35061691854.pdfIn PDF document text
    • http://dominant.name/userfiles/file/47304256515.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210907040852_dbid29.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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 17156 bytes
SHA-256: 37588984cd426f47a90558444eda57a301ce6b92cd10dbaf80a5cced1262bc99
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 11036 bytes
SHA-256: 065507c381e869fa1126d93f6ee3203e79b420d3d1abd8b129aecb9c58866bc6

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