Malicious PDF — malware analysis report

Static analysis result for SHA-256 3284a6296ff383fc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 07:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9bc2b8f3a34a7863fd865970ed43f0d SHA-1: 0ed4ff7e5c705b201ea29668e8b06a2307cd1e71 SHA-256: 3284a6296ff383fc2053055865004fecb2934ea79ce2691076916ce4ef55d29e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the PDF structure point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hanauhrova.cz/files/zumixedan.pdf In PDF document text
    • https://hkparkkonutlari.com/image/files/dakudovaxipujip.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/43616eb505014f8eb3c69305a517290e/fapewixikidujujubumebu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a926f64183---xopipitapisuzumadujufij.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/11724453213.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/27709679094.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/24753908209.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/26860196678.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/49822345236.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074425e0c1b8---zolelinosiz.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/74666197478.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1rse9ol23bntvuragl45kqlkd9/mozufexaniberizekidigenum.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/vaxavuxogoguxagizemizug.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210604141247.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3gvr7l558l2bblgmkiucc01mh0/46063476664.pdfIn PDF document text
    • https://dragulf.no/files/file/97600968183.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/xifozokawokirivazu.pdfIn PDF document text
    • https://yasacompany.com/upload/files/jifizu.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nupefukezarib.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/37512016c373f9ed87253fb83bb884b8/mujuwedorekagisanil.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/ropesiginuvitufupo.pdfIn PDF document text
    • http://tion.hu/upload/file/58643131025.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/vetaruwomikabafolevufix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chinook+helicopter+pricePDF 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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 10264 bytes
SHA-256: 05517f53bfc5579821e78a79858600d21ad72917d73b3acb5e9426d95f767f97
font_02_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 15776 bytes
SHA-256: a3321fbb1366c44b85c66478080c210f1604c07160cbb8b97801350e08439653

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