Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67ac5e8faf54704…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 04:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91bd68a4d22e183569ec8b7f30cd316c SHA-1: 85c11bcc4a93e944f0ca876e0d72795c32eceddb SHA-256: a67ac5e8faf54704230c4cb2dad65854301d96771cc271612c998d64002e56d1
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, including one hosted on a raw IP address and others on compromised CMS uploads. These links are likely used to distribute phishing content or download further malware.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://ng-sons.com/userfiles/file/13803728024.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/pogiz.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/82718196315.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/82998971398.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/53968122062.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133be4aa0f48---samemepew.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/torusovijudotiresu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/62156625296.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/98790044464.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/48dc4e1590e2575a37bca6a57848c5e9/fogamalagegukerunipibo.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/26393332385.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413c82eee73---17293702440.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109041106222420.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/xijozopekewa.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/dinutojamelorusi.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916072112.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613a74ec6e57d---44945316307.pdfPDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/247937916fdcf2a3d1c08e4339a19f8f/64068027845.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/magebubobubusosuguzubevo.pdfIn PDF document text
    • https://jin-ji.com/upload/files/danasodigokeb.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/88441198182.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/zaxosubusavi.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/gupavapujoxozefub.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/mozamumimefonovojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=funny+video+app+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_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10360 bytes
SHA-256: 8112d74676e4648ee093bcc404434a607d6a538f431a04e238766e64d2947ea5
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 17824 bytes
SHA-256: bb272d79367b414a76aa47d072895c05c71fd365de69c7f200de67212d96db54
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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