Malicious PDF — malware analysis report

Static analysis result for SHA-256 678ade8e41f0b9e8…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52a862ffc461f5b9b873f1bc52f04772 SHA-1: 7fc46de04429bdf5bf2c19744522624d6c69152f SHA-256: 678ade8e41f0b9e811cef8e8de026fb7b456536ab1d9fd180c7e5793e4d6dc43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=discriminatory+meaning+in+tamil PDF link annotation
    • http://altaprecision.com/userfiles/file/98671388649.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6deed22b17---81265802427.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/82209290247.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/nadepa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/68a1c75f5e4fdf7bcf6c28bd05806ea9/gunozapemijowexoveliduru.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/jixafifiwudizudapij.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c975188de23c6c79b52ae312071f3ce8/98443190627.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7246c9d07---dobebaneburur.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/5155661960.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/50440519879.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zujuzamofisik.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/90327169883.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727f92905ba---kedexuwogevolegagovumam.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/85228651348.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051616484646.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/49736922a8a6575e83feca2dad15872d/dafoxaxijavaseduzapawed.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/xolirusasana.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m6f06voksl5ou4a4so7rsp4ov/62568115545.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/77146906518.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c4385bb23492d375c206b80f601624e7/zewajozopapewugugonufov.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/vefopan.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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 17160 bytes
SHA-256: 65d540ae2dd813c4d59e019e96a400b0026205a2053f850a6590abb1e51075dc
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10688 bytes
SHA-256: a3bc14efbd1498fcff17e355e146000ca98d0c833cf0ccf60eb3af39f8c52951

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