Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b1fc74fc31aff5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 03:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ba20cd8ec752b641cc5447034f2ea7e SHA-1: 669b53088288b50b5adcca5ef46a34da37bcb8eb SHA-256: a5b1fc74fc31aff580fba21d2c4eaae14b4e11bf4ce8ac912c8fa777439e635e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting and compromised CMS upload directories. The primary lure appears to be a 'Pokemon Go hack' URL, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=pokemon+go+no+walking+hack PDF link annotation
    • http://9275522-travel.com/userfiles/file/22922167978.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dowiwase.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/vedijadijatudirifivinow.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pofafexexejobuxo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ag21jcsfr6brpgesd47g19kof1/33668510938.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/21099191207.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912064443162297.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/dujegowazusefosugevo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zudumodavawotuxixitulomiw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b6085089---rekejewobula.pdfIn PDF document text
    • http://pi-consulting.ch/download/gurel.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/solizor.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a57cb0686---wuzile.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/dekadijitafaba.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/53475260817.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689607df5---56699536019.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nubikudomevobobebu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sabovonoguxununugarad.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ab5507d3---fozekifabesutekogibo.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/4742599803.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkurrniaujcr46jh234l9mao27/gerolefafixusidebaperoxaw.pdfIn PDF document text
    • http://lgassociates.in/uploads/disip.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/33123358826.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/21034210777.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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 17968 bytes
SHA-256: 21c7a767795820d5370acb1c7be1ca2c0e7a105a3ce9b5f4c2e49a0bd9451b53
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 10488 bytes
SHA-256: e37e817c6d2c2dbc8a1f60dcaddd2b76105b53735fc92af62deacc19a6315b37

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