Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8f19c36085c5f4…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 09:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e04febad4392e8b7fb02396e0bfd5631 SHA-1: 62e4939337e94f9db2f66185fab38a70a14e105e SHA-256: 3f8f19c36085c5f45fc8d2a5c8e79e8d9133b0a7a500ee7504479c27819acd60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://chcial.ru/uplcv?utm_term=alice+cooper+this+maniac%27s+in+love+with+you PDF link annotation
    • http://aihyang.com/userfiles/file/tavurinaduxozagitenozaba.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a8e478999bd358fa04ae0c7cd0ad3099/9389669830.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210627073349305.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/mukopolazeletujuxuzul.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db25d3511---63569403698.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc066acd5---zisijosariwanudupa.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/sowupapowiw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cda498003bc5e730ceef01ae622c841e/sodubumagojuzu.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/banukaxovuvedopazole.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc0302098---pelen.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f4d585aec4fdb0d9896a40b463fa05d0/94121005761.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/bazuremi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be1ba37185a47868c03192e45ff68ffd/57572041129.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/66813979934.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/67299180079.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75848fb0e---bijozibunebaputigakiteg.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d35267e005b---ponesutulejowabixinodox.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0cd8bb08077b0ecdfd3391609591a5/36041750549.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/39736110141.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/radomerafumev.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5db2740f9f745ba35f1399a99c45f869/90197187077.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/raviveriludefodoguv.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b9fa22b9b---22706903279.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b8eb6ab---mezalorizirobikevur.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 11020 bytes
SHA-256: 9620a17cf3be53619c08da59ece9a463a61ef8b5d21c0d16440ca0e39c3d6a83
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 17792 bytes
SHA-256: 03ab7299fc3b09a4de22f72408891b1a2ecf3d99777ae41d6232ec6993e55b5d

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