Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d61ed9de90f1c1d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 332e888c81ae77e70deef0395fdc361b SHA-1: dae6a8088ac13150cb1775fa88f49d50148c6854 SHA-256: 9d61ed9de90f1c1d599ed0c77841fdc73c9bee5ddd9286220874b7ef5b14c09a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://taiwanquinoafamily.com/shopadmin/upload/files/74217261495.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/057facad930c6351568bcc50d5ea6949/19001747786.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/18023102260.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b86b863d7---32308382767.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/46818189158.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b2fc6d99---12061494480.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/96559452404.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nikudajurulud.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/jumapiziranisase.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/36073067915.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4320cadfc---69577848041.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wopudiguzorer.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kosewobefakodurukukome.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/duxefatafelozasenedesog.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/luporiwajukokumitepagod.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/puzuwezalaranibov.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/9361407143.pdfIn PDF document text
    • https://brod-plovdiv.com/images/vasarozurasopogitodepepat.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c71b62dec1c7b3d0b71848e08457d387/gedikatixifedulizas.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/21826784594.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/suniwuvojawedavitumosam.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/54728472361.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/39812438069.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/lawifubeva.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/51878799395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+del+libro+il+buio+oltre+la+siepePDF 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_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 17968 bytes
SHA-256: a1ffc1565f1dadcf33c49ddf7a427ff78ad382cec9b0df4c0a27efa823a82233
font_02_sfnt_off00013a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A42 10628 bytes
SHA-256: f1ea3640a800f2359c1ea50fe7cbf1b31c8d23a9b1eea2ab5db763a4f7a750f0

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