Malicious PDF — malware analysis report

Static analysis result for SHA-256 02400f340dab0435…

MALICIOUS

PDF

83.2 KB Created: 2021-08-20 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1f90d561b9877f8ce6fb5620acab03cb SHA-1: 3f0e4e1d27d7b637c966528fd5c06357d9b87964 SHA-256: 02400f340dab043547384923a90c546c6882c3c7e0bccca485d86d65ffbda5d7
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=mini+militia+hack+apk+download+unlimited+ammo+and+nitro+pro+pack PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0059fcdb9e8ead871e9dedf0df873498/45292774574.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9a462cd5---zasawovoras.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/77718450905.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/xitusufivufogoruzexa.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/17399201593.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/pudigulux.pdfIn PDF document text
    • https://nexusmediation.nl/files/ruwesadutoj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607924c5730a2---52103095573.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2f672e1d5---wuxiperodogu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/remifesageguwaj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r0pjschljj871ltnme7t1bjjn6/nakulerusukozavev.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/94201658257.pdfIn PDF document text
    • https://jin-ji.com/upload/files/joruzim.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/fawutamekatetovukaseb.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xadenivesejop.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/ledokanosusuz.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rdtffqd8r16k3lvf4vj884dof4/53918909193.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/87759545211.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9a630c47f7b7bf5592dfe023cfd8b49a/dukaxusiga.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/87f75d4e534788b4c054fc0e5158373f/kefufakiwuku.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086375e6c477---turewigomawubiwewezaxa.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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 16528 bytes
SHA-256: f6a5d56614155f7a7c830377fb9430b75bdcc98b8dd4760d6c829b25e038a04f
font_01_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10880 bytes
SHA-256: cbcacc08e6ac8e623964d0b51e652e6fd821c71dc89eb57641d702e3bc63b572

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