Malicious PDF — malware analysis report

Static analysis result for SHA-256 3854b0f9eb0ed7c3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-12 15:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbe31bd94ca93d4d730f2af4ef815974 SHA-1: a49c4fb8c3ef2fdf427d3fad2318aed2d835d203 SHA-256: 3854b0f9eb0ed7c33295d4f15702554a3cd3c841493a221f4f93a65da362bd1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or are structured as link farms. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+to+install+beetv+on+android+box PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369eb55ab51---kubafodatujube.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/filironobubonojewutojabak.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vigaluviwenisulonorova.pdfIn PDF document text
    • http://agro-partner.com/Image/files/26070309541.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/47031788021.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/88514026033.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/32573165064.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/92271518804.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/serezizevux.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/tubanosekisigilejasawi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/63071193295.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/joxarum.pdfIn PDF document text
    • http://honghuibio.com/d/files/65546858694.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/94604279089.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/70614477940.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3231d209---muvajaronomi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f670bf1a---nurar.pdfIn PDF document text
    • https://t2sc.me/userfiles/31322874250.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/figinirudofagegivepinok.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134a98b6a014---72736344134.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/timekimuzidojegumopolipor.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139059fd75cf---wepesawi.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907235914816074.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/98417089126.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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 15056 bytes
SHA-256: 5e085b252bbf52dd9c8c093d1050229e8fac69f12de90254bfbbdc52b7a1dbe6
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10624 bytes
SHA-256: ff658d3b173d666b257db9debb99906afddcd758460af666ff3fe444da49ddd5

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