Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbb67e5de4db892…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 03:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f260cb342b694fc7aeac98bff570d072 SHA-1: 2761eb32446d54d862c5dde5229fcfd154244c40 SHA-256: 7fbb67e5de4db89258bc85aa6d129f1fcb5507275f812442d24326ddce4bb2eb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of embedded JavaScript points to its use in exploiting PDF reader vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=download+latest+tubemate+2020 PDF link annotation
    • https://ambalatender.com/upload/files/wojujakefujiwap.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/ziven.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/46347757151.pdfIn PDF document text
    • http://grossbuch.com/upload/file/vader.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/ginurew.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09aebb33d20704520b72b71d452f47af/tobamij.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141658dd13a8---52255085235.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/vokesuba.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/godafojezitu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138767bb7d43---41182555088.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/34407164421.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mofepanojugexefizuwowozej.pdfIn PDF document text
    • http://standdominica.org/files/files/33261179488.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kifenimofojun.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/ririx.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/kodejozakiwasinapiwogep.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8gv6fcmli7565bsgeb68afo0i0/bajakefibirob.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zazobokuvoguvara.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/29992169557.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/43263670922.pdfPDF link annotation
    • http://cyclad.org/UserFiles/file/warusikosebebip.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/dogusujumugegojimepogif.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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 10784 bytes
SHA-256: e34cd9150e7b118942c0899bb7cef988f0d72977bcb25bd0899cb53d3e809003
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17832 bytes
SHA-256: 43fd79a1a353e6f125a08a84bf3d96156559d99c8472385336c3a4d18033730c
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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