Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d41c2a75780c953…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 12:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a9772849196a35fd7336eead2e99693 SHA-1: 9a4fd960f64dbf622b7fc9ae0d4673b9918d4409 SHA-256: 9d41c2a75780c9534314aa5810d700b4c0753db0428b6c03898b0bc4e2aabba3
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several heuristics indicating a link farm pointing to compromised WordPress sites and raw IP addresses. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea5fe6098---92069129476.pdf In PDF document text
    • http://arslanemlak.come/file/10886658977.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609efa5a0b5a4---14263697638.pdfPDF link annotation
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/733e0d7799347cecd2e36ee89d6091c7/revoduzarexoj.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/zagufojuloribemorane.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/95775034571.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1f4e4b14bf9439fc97ef983f339304a9/73238814053.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11579c2ee5---57502342758.pdfIn PDF document text
    • http://gdaniec.com/upload/files/kadasifupuzadifaki.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b13e99cdc---zapemebezumijeto.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093445d3b4d5---gizozobokene.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/192297bae81c9fe57e320cf9b351f60d/21528616292.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/46304704565.pdfIn PDF document text
    • https://luminex.pl/upload/file/52706687186.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947b07cf56---50697551892.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/16350e5c9c1516f56fbe9e67941213f8/wowobikaboxiguru.pdfIn PDF document text
    • http://bdn10.cz/files/file/77388654516.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/st0pivj7nr6a99cr3a2k9rrcbi/18264495037.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/povomukobedaxuzuwujejidu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/161654705182ef85902ee05b06f75415/bumibomatovidevobolupip.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/98e0934c1059490a2509aa4cd3463b80/60421642069.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8491c4d6fb8affaa88a3ba2ead040501/xagakitusidux.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63c8b9ab8---sorodaxinasuzulawimewak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pray+for+your+presidentPDF 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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 10660 bytes
SHA-256: 30dd60d5b53d89521c52195bc8a2c5463e92509a23aec5a5cdd14db3bcf943e2
font_01_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 17384 bytes
SHA-256: 7c791e20ec2325ecdd5de9116e3da63797d7e8be1f5eb6b02d1dd21baf5a3e0b
font_02_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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