Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcb640c6e8da995…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 13:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a5dd5ce5e897dfb3913bde49dbe25ec5 SHA-1: a7a068263a55f8333d192f3819ca040ecf8baeca SHA-256: 2bcb640c6e8da9953134e7800f4d958291594cc3bd514dca9abcfbe128dedcd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting further PDF files. The presence of numerous URLs pointing to potentially malicious content suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3db4004a---mugejuduwofa.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad400ebce83---88649660521.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/foxixadizenoziwifati.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a2966604---92575509050.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ca099ad820d71d75b98ee3dfd5d4e6d3/79099509566.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5461f46686---sozirevuso.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/43028278789.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/60956062046.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77158647082.pdfIn PDF document text
    • http://ashioke.com/images/library/File/levuneg.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/87746681680.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7b5f1739---goxarilolimul.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4cef7d1d13d45660a632ce6981a7e433/55352394080.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/93ed05472715a0093eb6bb799a1f4cce/20953997494.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf625873c---pavewuworuruvafem.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/52595e7fcb50598ae2ff2bd869916266/87171937849.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/voloban.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5baa18abfece62b09bd685d837ecca8c/zakipowitukazuzig.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee8a7ec8c---raligip.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a0cc9b13fa2721ec9960bfd1d6daded0/kabibanekagupaf.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e9eaaa7---33903637911.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376909a70---98611945637.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/29754874928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=overcoming+gravity+book+pdf+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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 11320 bytes
SHA-256: 3d3c108fcf8e077fcd8c83bed2a913aa743ccce92acad3dbb84d91675b771450
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 17528 bytes
SHA-256: 8d7f6bd7a276f384c757558ff72ba5f770f327c6930801f10f3d1ee3cedd05e4
font_02_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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