Malicious PDF — malware analysis report

Static analysis result for SHA-256 3546c8a04ba4e5f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 02:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f43ce27e73c5def6cf079be0f5056b1 SHA-1: fe1f5523c6861bdfc09cf45111dcee37250e65b3 SHA-256: 3546c8a04ba4e5f22c527bd58085cab819a2f136cc92a39cf4e211c2d4009ebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=renaissance+revolution+and+reformation+pdf PDF link annotation
    • http://arslanemlak.come/file/66109252701.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2d0dfd98---1380736912.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/21751702864.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/70121549076.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/43545493086.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/33623096324.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pedev.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/18998281804.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dceda176b---japasemupaburapisap.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab3d5e11---xebuvizavujuvimoxax.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c140ddd9755---wixizomafinokenawikaxibug.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/rebuditafesenedevebawa.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tiboverigekukalegokix.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/75273240243.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/59390649448.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/dafinenoserovoj.pdfIn PDF document text
    • http://patroha.hu/file/naxanes.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/67102819928.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210609_0A8E3199CE235676.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1035e8676---89568616472.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3095047f4---gigatugigijovufomeruv.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i20ebseee0nuo6p8ke99kc4emv/posulatitosizojumifu.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/pidesupen.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38193880282.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/94049748984.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 17884 bytes
SHA-256: a3e46f237233525e023633cffda7cdaaa10e4f259edb73f48d2ff9fefcbe6188
font_01_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 10992 bytes
SHA-256: 5625b01e5d7dcdcd16d4b7101fbfe259bc1cf8a0db4b51e04caa39d57a589146
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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