Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb22f4296dbb5aa0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 09:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b102be03baa1f5f79a5920188369598a SHA-1: b8ba7627eba44280047abfb0ecf1cb60bc30d70e SHA-256: fb22f4296dbb5aa096500e49ee0e79388491e820f8cf3417fee4448440bcb61a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content management systems or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=find+wifi+password+on+android PDF link annotation
    • https://weeb.nu/userfiles/file/79854478097.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/79399768100.pdfIn PDF document text
    • http://machin.kr/userData/board/file/84801311351.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/zagozelajivimemujomew.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/82708342409.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/12916851116.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/14903809615.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/87734955785.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3ed11bf6---zogoroxosutofor.pdfIn PDF document text
    • https://kapefashion.com/files/files/85751213356.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fevesusuvepowotuxonoku.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/55111347057.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3e0ab5ba---5240003768.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/kovatelijaf.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/38293134717.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/15377803116.pdfPDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ee7db842---421826120.pdfIn PDF document text
    • http://teknis.it/userfiles/files/67076209031.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210916_113149_132.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nejerugegemobemusuwuwu.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/sipesefatetobeze.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/popifusesa.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210904014832.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/15921380096.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a2fe469d---55474065771.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/18191517667.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcef6066c---kulojorazujene.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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 10276 bytes
SHA-256: 9f926711f77c4512620a1c5a3b83f7acdabb971c03a90dd3638759a3ae1265b0
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 17844 bytes
SHA-256: 3f803bef70b79d6a5783b9179d89d521df8f97063486832d73dc0440388261cd

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