Malicious PDF — malware analysis report

Static analysis result for SHA-256 a208ad36b3e2e462…

MALICIOUS

PDF

88.9 KB Created: 2021-07-16 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e67c55f8e403968562c322b651503a9c SHA-1: db83c34566b61901caed4e8d32710e0bc1229cde SHA-256: a208ad36b3e2e462538e297dff614916f94b24105cc1f6377f639734dededb5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating it's designed for phishing. It contains a link farm pointing to various domains, likely to host phishing content or malware. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=four+hundred+thousand+in+numbers PDF link annotation
    • https://777mto.org/contents//files/relepukadituxurizitalok.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/kodakadelakavuraforur.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/sifuxofawofonoxujeda.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/34201360468.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gqhldtr8r1fij4632aps07l2u4/78120799452.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db45bcd763---89173903428.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3c983e06---6085104940.pdfIn PDF document text
    • https://arerp.kr/data/file///14048065345.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vulifudepusoropepedolanit.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/46995997094.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/325102d908d026c5eb19ec42202e0bfe/51198179818.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/36145031470.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf83210058---xikududuxu.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/12kqi0cra7ovn6jine3vd3lcu7/nejerimasemozefutuwuronav.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08c1406da---51675618941.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d2eb212f---foradopatoxezaxolulufe.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/tulezezoxijosaguruxiwad.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/jelutosebosojozugexu.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/bidasigifudosonizekuwurar.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/buvugokafekukoxuje.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acac1b79976---pagopibava.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/87084576183.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/302942005ce1d5ab91beee2c34bc3dde/20600710516.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/66482186455.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e881d766a9aa84226be90b24e6dbaf61/jezeverebo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/11e1919ff258a68a0636f2a8d1995067/lanera.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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10684 bytes
SHA-256: b14b9b2592e65255e53047b9581660549c976911702ece6b48d96b63b15d5b17
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 17184 bytes
SHA-256: c8e418e588dae1f861cc5a41001d9b6a1f332cd03ec909c6494c59140ad5bb68