Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c99fc4cf5e7256…

MALICIOUS

PDF

106.1 KB Created: 2021-06-30 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7da10d183a5e933c5fa1111091661141 SHA-1: 8afbd35bf82c25928000fc3ddbd7f30f4192e57e SHA-256: f2c99fc4cf5e7256977cfe557467c0c5b7f2971172609d7475cc3b8c141aa88f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' indicate a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/pipefazexureve.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0352654b---bopufutidiwuxek.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/15a538ddd9b9b11cebb858886d64140f/noguguj.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc0e80844---datin.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/wokilefifaxipubuxitaze.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/bazulunawujapaza.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fb72a91e26db13bdbe88d04c5f671e04/26177440878.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4af7720c6d64c33d91cf0b21ba1e4ad1/50331160332.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88f899a3---92971060430.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/daap70l86710s9d6jmo1rqctc1/mujexisi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1717d3712---putakenulizibisumoseko.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meduvik.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b152d74d0ea---zunilomivulafenimikep.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gnhpslj01mrrbc97ii6ph8sbvo/80140627081.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fubemuzafetoraro.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/iu5oo9a8sjrtmgq73m81342ka0/wugisudujuxupigagigomu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dd16b0ac8589860708ce92c2518ba0fb/legezudu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/jijitotefini.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/daguvufapumuwutiman.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/23073058234.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210523/file/basojokidujubo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2tebm7173r62ii4asgif00sh37/zorazuwukexugar.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tijusokusugozut.pdfIn PDF document text
    • https://elektrona.cz/files/file/30215069321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=counter+strike+1.6+cheat+codesPDF 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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 3952 bytes
SHA-256: 9ffac8ce014d9d0021a501f7d44987c4c8f84d6fd5a260d31418c016b06e873b
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 26964 bytes
SHA-256: 68d5cd60cbe627c53cef1b8d8686242c485e5d7f76cf1ccb36bd9dc83431b7a1
font_03_sfnt_off00016684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16684 10928 bytes
SHA-256: 23dea4226d825b4a991a99460a2d82b37492de1683f00d3b40c139d33f5b0fc4
font_04_sfnt_off00017fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE6 16844 bytes
SHA-256: d40f1bb8c7833d4f7149882ac62d61014c940d95ffa645dfbed3e73ad24a6ec9