Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92dc315a8259b51…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 13:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37f1614e24c9c7a18597e44b0ea1ec66 SHA-1: aec7b88664c7e79eec80afb3eae5ac39d5dae01d SHA-256: c92dc315a8259b51b8a5d542a21a58a9ca90a648c063330c2bb9d0bde37d3385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or manipulate search engine results. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+create+stored+procedure+in+sql+server+pdf PDF link annotation
    • https://fasaac.org/temp//files/ziralug.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jonelowokepizef.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4sobfo63r47j2p87p2reqin0bk/dizosofu.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/21819692765.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bb833d88089faa0d792b1b4bb75f0249/vatipatetebotenirez.pdfIn PDF document text
    • http://jcpingie.be/public/files/buluxuxum.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/zumetuvinepokafevonaz.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/50169162815.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/retokitugazaz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/89465179979.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/gimegevupuzomemosazuxifu.pdfIn PDF document text
    • https://yellowstonewildlife.com/tufenuzineno.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/41722422000.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4686338622.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/dixiwefagedakis.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/97668641014.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0e8ed22c---pizavapawuti.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/fcdea3ec28440f336c6f6810d57202bc/sosadadapig.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462f9ef2ed---dozurefujojobibu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/liwodalilezofisope.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/62942753774.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d70b16ab7---gezaxutanirimasamaru.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/53699394250.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e890a2eb20b8a0e81ba85fa72d2375a9/ronoduropumixusof.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607776eb3d7e2---38953493214.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/21957953706.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1b3339c9ae00fa0830701b620585cc6f/7078782852.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/nudogulajanelugituvepimu.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_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 11004 bytes
SHA-256: 1f4d549d3bf7f798078c09a1f8e882838e60f3ddb54c46ef4f7a959ec0b62232
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 17592 bytes
SHA-256: 9c380f8c5ddd215110c1ff8d19fb9764216e4b8087081323255eebc681f4ccda