Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a755b1c1cfc312…

MALICIOUS

PDF

78.0 KB Created: 2021-10-08 05:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4011708fa3fa9aa5ca24c74463ff13f3 SHA-1: 91a8d579ee9ae45e062a2691c4a8b1705a0a1694 SHA-256: 77a755b1c1cfc312d73a2802d80532b2a2a13c306130a2b76ca36d3650cebad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting it is used as a lure for phishing or to download further payloads. The presence of external URIs and link farms on disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=parametric+equation+from+two+points PDF link annotation
    • http://arablift.net/userfiles/file/lisadajesebijir.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0f7c8c54---76027593750.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/nililirulozejososanananib.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/26632666120.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/47779374949.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/kenutedel.pdfIn PDF document text
    • http://ewtch.com/upload/files/latelomofurizesivebilin.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/mesopefomitanutugebaf.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/155c5a7444988fa31f4d72d0e6803a3c/mujomiloririzepuja.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/54230979914.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/xojoden.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/jewiwuselomatezi.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/raxol.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdcca3cc2---11632731639.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25803c48d---22742173443.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/gowugezev.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161563a73f0f94---tusotorokifikibo.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vudilozoseka.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/11783151000.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/wanavexibobabapal.pdfIn PDF document text
    • http://thevalleytrader.com/files/ririzilufidit.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/nilaniralimaji.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/17/36137900831.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/23231290741.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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 10928 bytes
SHA-256: cd87059bb7d3d2b08ad187ca5bdd4f96f24f21407bf9dd5805787d69fa15b063
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 18840 bytes
SHA-256: 4f3109655e5e4062765c02ab5d54c0a0b19e7768fa16d913d013bdcc7a63ad38
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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