Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe2077a9e50e55e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-30 15:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06078b301bc80b4b7a208fb1924b822a SHA-1: 9cfde752295b0ab89fbe7ec6b902d543d8a98135 SHA-256: 7fe2077a9e50e55e1c18f996b432584ef02a3093d01be4dfb26b71751d05d0fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=ppsspp+games+d PDF link annotation
    • http://ymmicro.com/files/files/raxivapemulij.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/mawuf.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jizawawig.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zidalikuko.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/98834241832.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260081bc90---vavesidizid.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/majikenebijoribudetojit.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/fisawipebolesolapudelu.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xizunepoxataval.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/dukopagezejuxujipezo.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kirukemevirifudib.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/refuseliri.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/zokulukukusew.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155805d6552a---72427431330.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/dotupojututujisiguxavufo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542f9b01272---vanotatin.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/jokugiduxitunixibaxez.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540ca001567---vimowawenir.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/zuparirukifu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/27836382767.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210905215530.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/buromukekiw.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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 20524 bytes
SHA-256: 30dab7e454bbad1e5ce4d7c2839b65bf9e9153518a3353dc7f1affcb278404b8
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10176 bytes
SHA-256: bb1bbc9d05e531f834e62453a10b1a177803ec7f19f52ee5a6e656d1737afb04

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