Malicious PDF — malware analysis report

Static analysis result for SHA-256 7098c26cf7397d5e…

MALICIOUS

PDF

93.5 KB Created: 2021-09-21 08:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 966a43eb488e212abdd2499b4e1c85e0 SHA-1: bae0560a9c458476f5beabd31a9550fbda508d05 SHA-256: 7098c26cf7397d5ef2e739fe623f267851a32477ca8d55ca460304f71a3a43ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm that points to multiple distinct hosts, some of which appear to be compromised WordPress sites. The presence of JavaScript and the link farm structure indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.advokat.com/app/webroot/img/fck/file/nafik.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/voxijorexiwuvimukibewow.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/81896579291.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147deb025b43---fumajo.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/kobunojumug.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbe7ac904---59038660182.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/36562154623.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/sutapixivipod.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146a40d1019d---88685701056.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/79678521998.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/68049451436.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d33120925---pesabo.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xejalemesitirofuzemotat.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/girezufixu.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/fopabosamizaxoratovazitek.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/15567940718.pdfIn PDF document text
    • http://ladna.pl/user_images/file/66752215185.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c09603cd5c7c11d7a431873b5feba3f3/dinuwesab.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/82013305480.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/14511140076.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/dupodukuroliku.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/75ef0a650b6acc34c14f0060c787fc32/bajegudusokofemomux.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rasomak.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mokamozomep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=among+us+play+online+freePDF link annotation
    • 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_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 18976 bytes
SHA-256: 96daf8dd52a13a03890b4c443478a40b3837a8a6b421c7bbb8094e9aa73a0c89
font_02_sfnt_off00014faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAA 10796 bytes
SHA-256: d51e3f79f3aa0cea171e3709b1d5daa3084d63012a56e6523e7cee0f4770d3aa