Malicious PDF — malware analysis report

Static analysis result for SHA-256 223e86fdce1ca51a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 04:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c8e3a5121fb5ee83ebb2b3cca92d26e SHA-1: 0a00f17b398255743502cec160b226687dd8b644 SHA-256: 223e86fdce1ca51a35136d8b1b791f693d84e362e172f8d6e06f08b62ac9644c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://bpsstudio.hu/uploads/zegepinufaxifebovinu.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/fubob.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/r38cfg0k1tq81bl8eqa0t4foa0/7647198314.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/188189203.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/79827375073.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/71924526051.pdfIn PDF document text
    • http://medi-sen.com/files/files/54087235497.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/64063283473.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/90943087083.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/gelevizimod.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd1e881fd0a7c6b0ee84e41c527a68ba/91931460414.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/63277501685.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/12570853305.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/jobesufa.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/29579588127.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346bda7153f---75242098688.pdfIn PDF document text
    • http://screen.by/images/file/rasuvasa.pdfIn PDF document text
    • http://renknh.com/ckupload/files/getusefixexavoluzimexulip.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/55613665673.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/60699174173.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fonuwogawokatemizukobe.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/gikidebumol.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/kaxetada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=collective+noun+phrases+examplesPDF link annotation
    • 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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 17268 bytes
SHA-256: dd4520d91a89ea24425c9ef87e062cdcf56e39606090c192c2f5bfafe66584d6
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 10936 bytes
SHA-256: a649e92d3902710a10575a86bb4ff003716978a3acb87084cac96a1a53d21469

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