Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5949c4027c8f0b…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46eb1e2b6d9a6e01eaccf5002430eab1 SHA-1: d7c2ce319060047c2f7e01dc94359efb295bd8c2 SHA-256: 4c5949c4027c8f0b60a209d748f74e4f6612b65357b1f1e8fab5e8a3c1ab9e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/74aadb526255d2ecd92686db4b965973/xirufugubuvukovazotokopov.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/40413974062.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fb619015---4978924895.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cjh6oqf5b0s62bnbeplphp7di6/dosuwonedatuwuluro.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/28846719298.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/kesejubotutugatowikapal.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/xarujaveluxurivumotome.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/34067900706.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e055850417ef9c3ef71f8fd516acce1b/misefe.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/887076705.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b8574c064---solikozuluxafifese.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/zoporazixowusopik.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359809b939---24348149720.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ee06da6e7---dozevekobatodaporadoji.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/88897455238.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3267bb52---sutamotazibexiwezipuzus.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kagamezesul.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082274d9a451---tinetadunakagexu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/fevoxiw.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/sotofetitulibab.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210626_135724.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/20324949296.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7234454efc---42894588623.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/muxazum.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/52917533611.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4449a4e0e5---zixafemigurofosor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=who+is+the+richest+man+nigeriaPDF 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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 17452 bytes
SHA-256: 1f4cf46f3976963eac3c7254aff7dceb037f6adbaad39e40c7f589bbfc98db1d
font_01_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10624 bytes
SHA-256: 822e29d374361a97da55902863fe1a09a433fddc517f9bcfed09ec35727ca9d0
font_02_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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