Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08d1d63bcaf0705…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 10:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 425e510c66347393f3dc70b3a5b43bb6 SHA-1: a4b35b6d02337415d8ad0e30ef12426632fe8e4e SHA-256: d08d1d63bcaf070584a69328dc8cf6ed0e6b725dd1b9464ad96d4cb51fcd9e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://siemreaptraveltours.com/userfiles/file/taberanesoza.pdf In PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/41598052581.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cce4a6fa6---fazuwigujugegapobodixodof.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/vufekepok.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141594ddcb58---98973702239.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/dalop.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d1a618f110278bb452ba51ac1679027c/38049683088.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bamakofebozaxora.pdfIn PDF document text
    • https://sanagustin.cl/files/togola.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_532D9DEBFDCDD419.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sifububilegubijum.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091603372973499.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wulavegosilotudupu.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/18355137720.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/96522548509.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/fenigo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9a883d5ea95f1d8bf31e8923746a2296/79836213410.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-8/20210908063845828675.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lesavaxebefulutoturo.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/23028585413.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/2499847456.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/35722641264.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/31507306227.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99775843772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=find+textbook+pdfs+onlinePDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 17708 bytes
SHA-256: 673ef7791df612b1bc19b2e89a7ce5019c7480d995d80f749f5b1ff637548b3a
font_01_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10540 bytes
SHA-256: 2b0f0d27330b5d184dea2dda4776ccc64a4fee8b6570b66f51c90d199d49cc6c