Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd12bf8e6df238b…

MALICIOUS

PDF

82.4 KB Created: 2021-08-30 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80c9bb1d7d506732422aef27c26dd816 SHA-1: eb0b986658667c9fba4a7da1581377b006f52b88 SHA-256: dfd12bf8e6df238b013d155dc31d977149b26da5226b540293c00743a8d15a0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to obscure the final destination or to leverage multiple attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bundoreh.com/fckeditor/files/file/sesotirapikerunenozovebe.pdf In PDF document text
    • http://vitrine-prof.com/files/51313928324.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pivaxeleka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ca6c3a860---45859839117.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/67612809899.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5ceb02604de64e7ca91c3924cbe86f28/73439401886.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ed113e3f309---xorukuvodefesu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161136e962db71---45493186230.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/16491636539.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eefh04ump4ma68s008olq8oj7n/88791222280.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jefawipu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a63fb3f1f---46590062923.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/50786440306.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/18282545438.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/wipokit.pdfIn PDF document text
    • https://khanikango.in/file/mavixo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8235c59a8---vesezidinotomusap.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/gelexusajozikomopepulig.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/sopejiwez.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/91711839937.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/37258488279.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9a1ece41bf8ba586d13be5f36a9c5cce/libekoxakizulebe.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/43807033837.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/63726321810.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/begijufijoroxaxudosirup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=polya%27s+four+step+problem+solving+strategy+examplePDF 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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 11260 bytes
SHA-256: 96044dfcba6c68919b734e3462f84d12fa9f9d5d025f00488d910875ec9f026f
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 18240 bytes
SHA-256: 186c729793d70ffb7fcdd54b81d6489b4f5dd5492c25c77f5e4c5180bcd39f9d
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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