Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a67bb96cf3c7364…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 19:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d33ad70165e875c74b4bcfd029928b8 SHA-1: 2052865c9c7fa1612de2059b6053924b01a3ab39 SHA-256: 1a67bb96cf3c73644d0a897b8a813e77b0cd020ddb7ae6ea5cdc84a70009df06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The PDF structure and embedded URLs suggest an attempt to disguise malicious links within seemingly legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://krisoc.ru/uplcv?utm_term=dog+body+language+pdf PDF link annotation
    • https://btsis.com/upload/ckfinder/files/xawozemededagel.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/zikevodefewiwopilu.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/21695014890.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16128ffbb2e49b---jiwoziperat.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/39886481756.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/4859212754.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287a699933---guxig.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/69912968738.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/69893712135.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/306de9d74096686f8af59f3b1eec81b8/xuvurasalaba.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2745e7ac00bb9c440be041b14e9536f7/zuvufugupinefububisupu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a554463950---3535736843.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/83704533798.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h21rcqbptduqaklukn3trkl3t5/toperuwevus.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661bbc3d17---noberaliru.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mupajujojapivoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0cdb852f---46690203824.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f50648cfb---64018632001.pdfIn PDF document text
    • https://angem.fr/userfiles/file/36453107259.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9553882d---41766693604.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/repote.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1790c7f7f4---79445218255.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/27773008764.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/vowiwesiba.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nemebajos.pdfIn PDF document text
    • https://maria-galland.ru/files/file/6002938739.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_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 10568 bytes
SHA-256: 02ba8f725978a064ac55fba9b66808859e38b4f98d381889ad7dbb2ffa6d513a
font_01_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 17536 bytes
SHA-256: 6cb7fb916c20b04298857804a0d1d9adb9d9c676ffaed6d0e5bb23682741d0c1