Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10d5de22316bb7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 23:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95667baf772089a9c0ce525b48e2a7e6 SHA-1: 46135916fc41cb7d3fc5d5801a0e26057881b537 SHA-256: 3f10d5de22316bb76fca6ae550f2c0badff620fbca52cc049732f35c591a9478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised WordPress sites, indicating a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/38063763843.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/21878486226.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086d424089d7---solofoxewajupupevesusa.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/89342365252.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf19eafcec---25826150377.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/257e1cd8ecfb66330afabc57dbdf6fa0/4884281821.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae028b66833---38707668977.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad69f06ce5b---79237210122.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/zibufu.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/72272257033.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/mudulow.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/58567471150.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a244bea36---43094017985.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1be0ab5ef0---7635820906.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/bosukusinelabokute.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cf8f198a7a6889891f9b05f8b1b9e927/rifigukizapiloj.pdfIn PDF document text
    • http://riviera.az/userfiles/file/92546596088.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75929738619.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/99122809077.pdfIn PDF document text
    • http://hevolta.com/upload/file/24429308180.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/rilatagizowidarolef.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vrhjh5ec245ohjv82sq1tkau85/pemokidim.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef8532925---50155995306.pdfIn PDF document text
    • http://3q1p.com/upload/file/210731041919511002ljo9pzgb1h5o.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+merge+pdf+files+in+adobe+reader+dcPDF 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 11180 bytes
SHA-256: 630509c2c260449110f85578eed5a0cdc16cbf4088814469c7172ae9a6323623
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 19888 bytes
SHA-256: 5b0a33848c56c6368a15b5eb08814b33f684e62963dd236b018d39c4c54f4f5e

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