Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ce0538e6286451…

MALICIOUS

PDF

98.2 KB Created: 2021-09-04 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b032a7da87c45021ea41545b9bbfbe59 SHA-1: 347f91ee76195cc593016578b60b95468aac3fc3 SHA-256: f1ce0538e6286451ccd11500bd6ce47ce35f53bb7da2d1d6fcea5ca6ac46c1c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. These links likely serve as lures to phishing or malware distribution sites, consistent with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=robinson+crusoe+pdf+cz PDF link annotation
    • http://computerdoki.hu/user/file/15588761512.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/50792039420.pdfIn PDF document text
    • https://4appsoftware.it/file/29130071314.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bamilefoj.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/xatigikajidulidusujife.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609386397275f---xajusomul.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/panejepu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6d694ebe0e98add8a3b6128a3961d30a/21323338970.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/94851515471.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a817b8b2476---motozolakexob.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/zetadelirugije.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/88045980771.pdfIn PDF document text
    • https://aksusu.com/upload/files/1572930278.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a6358ce07c596fb46ec59a4473929457/66787023331.pdfIn PDF document text
    • https://coevent.ru/upload/files/58463158524.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626881840zukoro.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec28b2d0a1---damukirijawelimi.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/vudomejuxexikexemozurok.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9deac8f853d624f19b6751eeb3631c18/43733379582.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/15265058733.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/17651223799.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/76180743992.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/54994554155.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007c05de6e3---69096977355.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_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 10652 bytes
SHA-256: 54dfd14dc814eb60a992ea5495c4a5994e38528e56722c7a1d5b0069da41f45f
font_01_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 22084 bytes
SHA-256: e41809f05ab1720d0d0f828c99958e2f98ca01663aaa513fce27edb18db15d3b
font_02_sfnt_off000162d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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