Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37378de7da71274…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 00:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dbe67a5ccbedf78fb0a6b01ba3a2844 SHA-1: cc50185a8a64a2025c6eb49cbccdc4adb155e66b SHA-256: c37378de7da71274d46d92f93712ccfe04df234011b847c2594f1145634c7a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm directing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bikidi.com/UpFiles/WebEditorFiles/file/mipubo.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afc25856b---zitujutexogogaliwibagef.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a92667b21da---rusugifukunina.pdf
    • http://rialta.ie/userfiles/files/29801914650.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a384e51c21---gelavafadat.pdf
    • https://martabaktelor.com/contents//files/mevek.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/48b275d3c0092d3949a491b6556ff2de/40533418648.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/k5apnqake13iad9ngabpo25jvg/guzukadozi.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c42c0c311fa---89033460924.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e22fd01bbd1bf6f556f1865892a8c979/kawetazarubit.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609727250ac25---93809603230.pdf
    • http://writtenmail.com/upload_images/file/felivojive.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c830d71492791b3857363ad93434d5aa/misulojado.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33354da7c0---pukikivobawirew.pdf
    • https://bbpartner.cz/userfiles/file/xexubuvabobopinarava.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9827cbbc512316d5c2ac8dace232ca5/pikunozomigowofo.pdf
    • https://daiichitravel.com/uploads/news_file/jijulakunuvugoreses.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834a3980ff---18989801747.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/58af3e596253c492d137d501adf6924a/kudafokajokovojiresipala.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd4e3d449---64709000557.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c54245775f3d498db394007ffcd419a2/puwedolizotuvavajipeve.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2b500aa0b---vimewenevafinuj.pdf
    • http://akinmedikal.com/uploads/file/wikorebo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=muscle+tension+dysphonia+treatment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ac.bin
70444e1ca2423a173ad9ff954a16962ca1982017d59b9a232bb573765935eaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10984 bytes
font_01_sfnt_off00011a02.bin
0183bee7e0d3d9abf27a5a5ef02dfa5be0610e488319685a792184760c8edc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 17828 bytes
font_02_sfnt_off00014862.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14862 16792 bytes

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