Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d97fea7592c6a5…

MALICIOUS

PDF

105.3 KB Created: 2021-07-19 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eff042c96adb0aa646ec735d8e68f7b2 SHA-1: 2791b68f60eedad92e0c53109078c7fde678ded8 SHA-256: 77d97fea7592c6a5a4b63bb688c270a34e1c715746df332a8dc4f1996a2a9630
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://heks-tech.com/app/webroot/userfiles/files/85163957558.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba355da06---zurotesewawisirevozeso.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sizakajafinomubegawewup.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/ridufijarixekulu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xowanonerefawivenunulasup.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0a77885c9ae3b812b69f4bd0a5b33b19/nonekuven.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gueadbg0pg17hfbj1jvmdv4pc9/88739808825.pdfIn PDF document text
    • http://cecev.com/stockages/files/tasunulane.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/tufomupugadorepabe.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cecf82a2a4cd120d3065213d5b7904e3/49156938353.pdfIn PDF document text
    • http://ligneus.hu/upload/file/64086021176.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a45aa7922d9---nusovifarilefumojak.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/66560515112.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/eu5mbtdrli32ntssul2l5uauul/660624950.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hkp8fuqd2tqn0trjmu9e782q67/sedemupogo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd390b3af---pepopepelij.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kerm5n922dk35bslnj4rc06ke0/nepodozajaw.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/pelekabotonoguzefe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075441ee3cdd---69640390125.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/97475309005.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a89e41ca963fe502474525f626cdf7ef/wesamopakabuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bland+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f71f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF71F 18772 bytes
SHA-256: edeac30d1667a5fb84b35daedcb0e417d078578539499eee006e1c112938177e
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 9944 bytes
SHA-256: 4193da60e80faf7cab71e0f80e1e7851830c7fce6b0ff0c6789531df826dd6ac
font_03_sfnt_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 5220 bytes
SHA-256: e3cdee5d2066ff5e94e7e0fd46a6ebc4919cbd3a7f3a219626f4afd44fff1b7d
font_04_sfnt_off00015752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15752 26096 bytes
SHA-256: 973f7591b213f6307ebfc55ebf14e6a3116448b02515c4d242a079b07379abef

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