Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d730d564aa85fe3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41beb3b80a3de55183e6d7e4172e42f8 SHA-1: 673bc08570482d78fd07fa241132adb123b3b18f SHA-256: 5d730d564aa85fe362f98e206aeffdb6e5781adca08faf4af8e47de23923d02e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and 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 URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=can+you+have+a+miscarriage+after+a+week PDF link annotation
    • https://swagath.co/new/ckfinder/userfiles/files/garotemubetudefugo.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/zobudizujojidilemufelokoj.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mebifubaxezuwuf.pdfIn PDF document text
    • https://seikai.jp/free_images/files/2788271292.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30e6bed95---5601389091.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2eccc4e8---72135748130.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ab1ab88ee9964bfa53af4dad7613560/worabalevoravakara.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/10808421175.pdfIn PDF document text
    • https://ismart99.net/upload/files/tuwejifilizo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80686194369.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/62730137246.pdfIn PDF document text
    • https://electroagro.es/pub/files/15914589264.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/55683710944.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7uih41kv2c6uu48hq7h0sf5hc6/xogoguxojuwusosufi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/166c11c7626abd1d1c50800955b5fe0c/67071580371.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/80064723989.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3377edd62---62492885823.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1timnnu2hdij4a50iq6dubjui1/povis.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/wiwilivewono.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sobufomogazowugesafu.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zuvirozek.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a6b9b8a54ad2e87514afe12df670e2/ripavisuwuruwasowor.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/kexiju.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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16640 bytes
SHA-256: 646ad30215ab9aad42396b3b05f3be95ffb4754a705d74c3be7027eb12cc5ce7
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 11224 bytes
SHA-256: e9e662ff1479c08d3afef0e98e68c39abe3cfab57e878c0d4551103a1da8a552

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