Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f4032fa9e660bd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 16:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a85920f196ea36c7f4c6f0972a1ac8b2 SHA-1: 8aa53dff2ca9f7e0886d395885d06268c506572f SHA-256: 71f4032fa9e660bda5ca26a528c15320749c28d78a38ad6a72a573e716e295b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious sites. The file's structure and embedded links are characteristic of a link farm used to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=what+is+verbal+communication+pdf PDF link annotation
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vuniruduresi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613061ea7e7b0---67374400808.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e34638e152b---44134945327.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/watemavu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5d75a007---4571580791.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/worom.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210528070359.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/gapibebalupofu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087926c7ed84---nepafojurunivufut.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/78396080785.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875033876c2---gurowopegupumebipow.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/59749438915.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/korewekowutozi.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2etgojuu0cujflh6to4ekdqovs/38429207403.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7fae52bb---luzuwafibopavegi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/33562534432.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210705_47067E715D16FC97.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/bokijif.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083729ee2bfd---81162110945.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/kelivebafusoxoviwibeviwa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d39ef4f90c---32572783111.pdfIn PDF document text
    • https://digireg.li/upload/xarogutewunila.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jutuvoxabutabizipafakori.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/demowirofoli.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/rozutafap.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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 11184 bytes
SHA-256: ba9f0fb3ac1de6c536f364adc06743762d01310cee290bac0194f49713253cd1
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16472 bytes
SHA-256: bf2ef3e1852576ae0594478779e82b0896b71534651f31658117764ac025da24
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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