Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad19ed77b700523…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 08:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0e00515469a1eb81a7934ea703714d9 SHA-1: d71307b528d2f05f98980948bde91f97339ba916 SHA-256: 9ad19ed77b700523144401e89215e9fb28731e615d4fa06d209eb730afa84fdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gestaocipa.com/public_html/Imagens/file/zobizugivipaxivime.pdf In PDF document text
    • http://gesgo.de/userfiles/file/65857554254.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/3953409210.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/86136803846.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e8spebahebmfq8cg2vf0fr130q/roneg.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0ebar1rek905kumejajm1cql7/zozodilisosojetalikumow.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/37646044789.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/buzelak.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/16154275610.pdfIn PDF document text
    • http://jngf.cn/files/file/34580531358.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/pevawopitutudigafibu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/bunijuvek.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/xetobuxifukogudod.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a730b696dec1b42f39afc2708387e0a6/72583078402.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ad0d345c---mafavowela.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/90443365643.pdfIn PDF document text
    • http://machin.kr/userData/board/file/82598648619.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d3745c4---kumekonaxetetizabuxop.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/giwuzipeguwaxatusaso.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2r85645d300ni2krok7au7s8o5/kidajarukuxibu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d43116bf3f5---30612259867.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/7762683842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=polynomial+worksheet+grade+10PDF 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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 11160 bytes
SHA-256: 9afb32431584cabb361f6e10081ab5016960016ca6793064c48e27cf8b857d83
font_01_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 18268 bytes
SHA-256: 295d84aa5ed7e9ba9aef9e54994e082bf27dfb3c1dffde5d06362b8acdde14c3
font_02_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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