Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ec41223698e637…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 06:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ac5e194cab221a74e9f11398fcdfe71 SHA-1: 46bc111d6ef8fa071d62003e77b35e5a89878781 SHA-256: 62ec41223698e6374fa02185ae7b9fed113c4992eb385f1953ccdab5cb1ffbf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=spy+mouse+download+android PDF link annotation
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/12808286571.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/43540163746.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/59110559344.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/jaditubezimoto.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sejuferodevoxesaw.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/vularamakomomavevuf.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/19172480865.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/palatibirodonuwabosutele.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/50f900d9fc25512a27b8adc45ff0b944/bopikozuvodokokazewonavuk.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/42797822737.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/96480506166.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/pifekasuvawixalumudat.pdfIn PDF document text
    • http://geotersrl.it/file/silaxowinegamaxalukugi.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/47068573955.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/26996883244.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c571ec302---36491509674.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/24359448717.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/mevowimewowomedut.pdfIn PDF document text
    • https://ayurmitra.com/files/file/22296842103.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53198795412.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e28dad5e4b---begevorizomegufadojuxedi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/35295bb8f7c700b847defb903c57f3ef/gogilunejizezinisifo.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_off0000b840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 18824 bytes
SHA-256: 7bd0f15a678be6f7ad2f58aa99727e4340450968c80466e4f22ddc0733880f46
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 10828 bytes
SHA-256: 35ed59998c781e8b2e2e6a9ee60fffbde5fbe7f49c32ef5ca3e6a699b2327202
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1