Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42f524558b7dd19…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 03:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d546c04e145f2c43d4273331242c6fb SHA-1: b002e9f904d8f97fd8e55923bfb17a1ef3f6a00d SHA-256: d42f524558b7dd19153cbb60d352e55ef944073f8b6305353a2f3b22cfc4e2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm heuristics, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=highway+racer+download PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259739040d---79949404266.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/mixenilajekodaveza.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/7919035693.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/piluvojolugejuvine.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210913123350.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210916041803.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/66323876830.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ceu5q1cqns2f7qtqvpg93r2m6p/vumalasizazedilusozanimu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6c6c264f6---pemetuk.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17526783373.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jewosufadilizere.pdfIn PDF document text
    • http://marymo.ru/uploads/files/zirexitizovasitopibazan.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/mivaposiwisajudatip.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/dalop.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/sadilaxemisibudigisim.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/pixubepovixawede.pdfIn PDF document text
    • https://novsport.com/content/File/39401209456.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/65425928507.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/60561259110.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/72351260265.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/wevaziwivazotevinikoxoxo.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/siletivawamapo.pdfIn PDF document text
    • http://mextro.de/upload/files/88396826833.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jusegefolosasujumamadug.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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 15188 bytes
SHA-256: 3c43ab85a08146f30b63efc5476a343a9d5e68779cd1c4762e10967854ab28be
font_02_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10576 bytes
SHA-256: f8e730f0517d6debe5f6b2983f0e5270070fd689a4fecf1cea91a14bc66d68b7