Malicious PDF — malware analysis report

Static analysis result for SHA-256 81401659fe5c112d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 18:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8de97a925859c62686b5164a02e3f6ad SHA-1: 552e9323d1e32f0873bec6f51ffb2097feb767ba SHA-256: 81401659fe5c112d9ae9f35e2d4dac85caa5f264f3016ad28d2afe11bbc85f2f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and compromised CMS upload links reinforces the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.lsv-wittlage.de/ckfinder/userfiles/files/busodatopogupuxufowoxulu.pdf In PDF document text
    • https://legend-chang.com/UserFiles/files/54543051892.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/emufi8ge9vshqresaqib4m8gl6/35570552223.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/99b53a8fa11f1bea595b734d1c366dc7/xuvoxozubopisekuz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d7a9vhjqddqp2s3bb91both18o/vekitudolijagex.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/15035202268.pdfIn PDF document text
    • https://trexanh.net/upload/files/timiwebemimawomokixefe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ce8742c48faea854d99c23b88f4a24b0/mabus.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f8a258228---8663961695.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6sgp92d915ejplhgsur4ijo0e5/wafunovugi.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/69174347418.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tovufavejiki.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pitolewileximomaru.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/97990084447.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/rudetosutaz.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/69040610686.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/21de9e8827d2abb3ee60a2869ea576b4/ripetibudow.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b445fa67fccf174e343a6a986a13f709/fofawe.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_041259.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/notuletuxetawog.pdfIn PDF document text
    • http://ibb-online.ru/f/file/74358661821.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c879a435---senawiwidakozezo.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/ladex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bearcat+sportcat+scanner+manualPDF 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 20844 bytes
SHA-256: e66520777b900ca3ac20f1e09bbe74d377ed16c7ae816ea9948f53ec6199765b
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 10596 bytes
SHA-256: 732c056a4eec3445adce5bde544608e5504eea75b8fd70d1d61a4310ea135c73

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