Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c92951b9b9b21d9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14a178e6709ed6c0f54002caaf7d86bf SHA-1: a6c8f186cdf45ec7bba182a2f635cd627c332268 SHA-256: 0c92951b9b9b21d969b19639a3b3c22b51dfcc9d380ba95224f1efc1337cf6ab
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple domains, likely intended to redirect users to malicious content or phishing sites. The presence of numerous external URIs and a link farm on disposable hosting strongly suggests a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://egitara.com/upfiles/files/mukuxuti.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fgsao8bd7meqd3tl6jd2jkh0df/75470784489.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7573ecc---82124045927.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/4892242726.pdfIn PDF document text
    • https://robertbah.si/files/file/51197433125.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e514e9d0b---65922396260.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912035725_87675510.pdfIn PDF document text
    • https://fobh.net/userfiles/files/gibisit.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/3298948727.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jedamivigo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/42934362564.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/15097333351.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://hoachathoanggia.com/userfiles/file/josuvogekawebudegagatet.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zozemap.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/68366099597.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/wuzomatonudafumifo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/juzujenemo.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/masegixav.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/50609725492.pdfIn PDF document text
    • http://wdnederland.nl/file/7518837688.pdfIn PDF document text
    • https://shidoremicrosys.com/media/21680562104.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56161267434.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/2056819370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=super+mario+all+stars+free+downloadPDF 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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10920 bytes
SHA-256: 362810395250684f30ddd0b66de0eae870a5af8aeb3e67aabfcf1e4629461941
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 17364 bytes
SHA-256: 730bc45a31676e98b25545f2e2689cb3044e0c24e146f72980360c2b24695a1c