Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6277ae2c4d18099…

MALICIOUS

PDF

85.4 KB Created: 2021-07-13 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77b4792838c6984611e627b06e16c27e SHA-1: 50b292c807c26fc7cae53c4d6db86ce863310110 SHA-256: a6277ae2c4d180997fcb7c224d62d5344f16e2d3de84f51046f9de4190026ee5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan PDF. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://biolabsrl.org/userfiles/files/sakatapudobedabubof.pdf
    • https://fishboat.hr/files/88787680305.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/jpts2lhcdcvclt16p6b8io9a05/zudiwabarujujidexu.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd6485fae---kuviwopasebezuduzivedi.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbcc24e74---gipaji.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16e48dcc8---52036142696.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7f93c00a---78175311040.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9ce72de14d309d9b603f2c04160bc7b9/80861467299.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae5b66119---teruvokolapokogam.pdf
    • http://prosquash.by/data/48750338964.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739feb4cfef---86702114767.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160908c7cc0830---41331191097.pdf
    • https://cottonweb.net/userfiles/file/zilizetosodifan.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/77883252041.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/zadizas.pdf
    • https://camping-du-lac-dijon.com/fichiers/16178959907.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/darimeripamuxurodebagej.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/78dad9de9ee04c3ff75c65a58c05b369/80701868443.pdf
    • http://tetraeng.it/userfiles/files/12941629618.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be89b961a46---mibenoparaturo.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825d3225247---98204032448.pdf
    • http://otvorene-srdce.sk/userfiles/file/21609539502.pdf
    • http://jfkanacon.org/data/userfiles/files/detaxazuwabixevorofojifu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=seussville+free+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16792 bytes
font_01_sfnt_off0001053b.bin
d9cc9d7917a0ca776d6d3292037913585292c9de2e1c8cf7f7e8f08117a92518
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16856 bytes
font_02_sfnt_off00013127.bin
c482172b60bc5afbef2122c5a7d5ab62c4c363e46063992017358b4ccf72b8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 10476 bytes