Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f3201bfe926f23…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 03:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0dcc1b039489550229d551b1cc9bf9b0 SHA-1: 64dc1e8f5cc0aeb6f5824e1920dc3755f6c1f298 SHA-256: 98f3201bfe926f2347d2a9a554be989c42bfad5dae526df4d881a0ed36f4c876
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple PDF link farm heuristics and embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/795b0e98a97dced0154afea3cfc17166/nenobevitukaxubowugibiz.pdf In PDF document text
    • http://mobilenmr.com/files/files/visukazazebi.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/6156946393.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19530d3d80---firinojunulisa.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/joxenewosinakava.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa43cd982a---33727791870.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/jimakezetixazidotidibapov.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/veweni.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/weseguwapene.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/wubibexiv.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/086e2cb74c35aadd418d848e8668e3e3/31006126857.pdfIn PDF document text
    • https://olterus.net/contents//files/61067966627.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9316eea96---nidikiwi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c4d4afd03600c084a15623d050a9dfce/70292371997.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c09d9cec9---88021215919.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083732c2d17f---bibebigixifiwagikoserid.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/rogenararozudo.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lagiregapewufone.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nibazibuvabo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c5a86e04---wajidorejozenumekidewap.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/8258052655.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210609215754_vl9i22.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/tagewogizowirugesurikupal.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080366325f9c---vonipufakovolap.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/debuwitunugegare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=an+introduction+to+fluid+dynamics+middleman+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 10976 bytes
SHA-256: d60ea12f25e21f640dc8fc0a7a2a67be6c79257afeffa49e6a64f4e288b3f907
font_03_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16592 bytes
SHA-256: fa1c929fa642cfcf0b0f43639b68849163276d5ac12b3a2745509c9e16db8afd
font_04_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17756 bytes
SHA-256: 7a2990c8ce339dab0ecd7f367a626fee034f51fa9e52e100a6bc095bb4e2ba02

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