Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fe4e095ced9e61…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 19:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a55f9b51c5bfb496aa2cd5c3f8d90847 SHA-1: aad4598ab2177c81fe06ee1ab86377cf61594f9b SHA-256: 13fe4e095ced9e61d7f0ff877154890aac438172c63f32348f411a892a303437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to one of the listed URLs for further exploitation or phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=play+store+does+not+work PDF link annotation
    • http://osingenieria.com/images/admin/file/lemalujupebiniteriwujokow.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pimiserokijuzedazox.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/54468785359.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/87918687991.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/rulefa.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/rejagukawu.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/fipigopuro.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614730571afa6---laganetabanajeti.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a19a8b22---rotoje.pdfIn PDF document text
    • https://kimcert.net/E/file/4396042420.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kikiweferulodabejepilete.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021982349151759.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/54855473659.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161431e28c2c18---28241052074.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/66097385575.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/584da29e1eae10c2f06913112bf55c79/85737841171.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/47459143808.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/tazanupekomigojusawig.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df7f033d8---xumobijapisepotixu.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/16263454809.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/m8kc0njt22i5vcc84atbgnit7f/xunojifafuwu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/biwamuwarizaxisiwaditulit.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/17296950172.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/96512597116.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161302c988f644---pokinozarizukidalepip.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 17964 bytes
SHA-256: 69237955e2b2dbcb9dfc4da4a319043dca7d4efb3290c0166e428b30d3a97122
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 10440 bytes
SHA-256: ff232e6580dda18c7f32253d6194a267d36735a1cbd5443c674fe5f77717f35a

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