Malicious PDF — malware analysis report

Static analysis result for SHA-256 55124ae8a0c3aef1…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 04:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 576c50bf789de7d455ecd1811451a7c3 SHA-1: 8d2138616c48ea3fd42662ce56fb08c34a699b7c SHA-256: 55124ae8a0c3aef1a111ca2bbf8ea4b4dbcfbd41af72a5932dadc022ef4d0c8b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including links to compromised CMS uploads and IP address literals. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The presence of embedded URLs points towards an attempt to redirect the user to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • 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.
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c945f9a1---56935578479.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c429adbaa42---bumorigigedower.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/89e4b42c5420bacf69d4214e6b5927c0/manenegesopiromazex.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e45e8363---lekujobanalimelurap.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace4e6d59a---94634295867.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7932d1aa---gutifibosutojutiripidebev.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6eb5f17b---20941243485.pdfPDF link annotation
    • https://webvitamin.vn/app/webroot/uploads/files/13405654780.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/guwefesajibezeledewar.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zivepujumekebuxobefexok.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/luzomuzasulojukogele.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/89846223511.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/petevufigexukizimogoxot.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/37aae669e5be81d2f01a9b9a7ed46bbc/dajibodejiroxikasetufegej.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aab3328813d56090b988088edac36abf/teloz.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/16243643657.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4173ucktb5tilk7khjo9g78h04/zotegubekukuvenelanu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/dimeminega.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/wodogagopupironiredovuzu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/684cfa2c1aaf1839fab4c42bab2ea6ba/66855394983.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c790855d3a3---tuliwijeniteded.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/matuvidapidigupoj.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/3063637378.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4600752252---70777722848.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/jozuramazerupamuzodigedup.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/92447395624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=silver+lining+pawn+shopPDF 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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 17016 bytes
SHA-256: a527cbe987e56dee677013a84c37e23651b1975faaaba87c15e2ed4ff9b6c6c6
font_01_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 10660 bytes
SHA-256: dbb79a056f2c3bf22c938e45e13b5186c61775f2265e38acc3a6ff0ca66b9bc0

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