Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5fe423d285065f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 00:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7442b286a4b13e2721376bb7844ca843 SHA-1: 3cf0103d60a963c93cc373134f8992296b64e1ed SHA-256: 6b5fe423d285065fc07dfc52b1b41e92746793bfcd7dec110b09c0104b9d1eb7
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of urgency language further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://schuetzenfest-hemeringen.de/ablage/userfiles/files/wurufajuwufudikawagapaj.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h0p6ggr9el70ancgq3crmpetb1/79037291187.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/nepekupek.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/8284783899.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/41554177241.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/20919148010.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/borazezonozuse.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/10902435474.pdfIn PDF document text
    • http://bienbao.net/uploads/files/41860522253.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xojosimilugu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xuvurexanowedub.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zepigisavokuf.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/getej.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210919091827.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161467b9b3d151---60954375634.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/wukokilon.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/3975611537.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/68424038637.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/2772287408.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a93eb1091---gijufinulavovew.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/finixagafora.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/melurivemuso.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/63317772901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cine+hub+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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 19780 bytes
SHA-256: f1422cd2b053aff1aaeb0303c14b1c59cdcdcfccd06af48fafa8da5b336930b6
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10572 bytes
SHA-256: d99c0e8c6bd6520bf7f4cb978f6a41d2b044eca8e828980fdcc7c817d2b7fcff
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1