Malicious PDF — malware analysis report

Static analysis result for SHA-256 802fd7b21e201539…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 02:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c7ee349b6a7f295fd93336039f9881 SHA-1: cf136ef13271750e881551e7fa613329d45a6322 SHA-256: 802fd7b21e20153947b8fa047d2e58861fe44e09ba216923829893d925dad7c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=mobdro+alternative+for+firestick PDF link annotation
    • http://www.donboscovizag.org/images/files/92825289336.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/85612931371.pdfIn PDF document text
    • http://artospace.com/pics/file/81298656518.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/fikazazipunopesiz.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/40872937130.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed7c400e5---35536737541.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/19389104078.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xotulokapovijedazuteji.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wewozukojiw.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sotatezitos.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/2064568129.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/27332746229.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/votoditemavinef.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/mepenexikajonuxan.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/77071762506.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/98155778352.pdfIn PDF document text
    • http://elitacasa.it/images/file/tuzavaragakuroxu.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vutajabuzuxijojanutidu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/6208109749.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/80777887347.pdfIn PDF document text
    • https://zzwgjx.com/d/files/17992632710.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0faba7db9---vemib.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jopadanaginezenuxamav.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402d488ec94---10543544103.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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 18276 bytes
SHA-256: f028eb447e2a01766d9af2e9e73749123c3ea945c6e5adfa180f44a1ae99926c
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 10760 bytes
SHA-256: 1598aaedc2c9fe3b6f9b41ac3c661dedd23f883c7f723dc67e54094b4e82eb34

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