Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c114dd411c9c82…

MALICIOUS

PDF

91.9 KB Created: 2021-09-04 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 221f8ce22be5c6e76bbf762b5d06ab5a SHA-1: 32a2db7c89b77acc77d044d8a63cde903dbb3b78 SHA-256: d4c114dd411c9c82dae80454e503f20400ec9a830b4891950956a97eb1969339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=aw+tozer+attributes+of+god+download+pdf PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-7-5/20210705043729388020.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f350bd7f492---65060674075.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca95a6b14b---89738080829.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0941be0---xumufo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jopowatuwevomomubelasud.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d617afba8---rerogojakevilotiturelo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2ca1f448db8e0236c2344165c9cd415e/dabavifesu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062109015280.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nazuza.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dobjqut1e5gdp00rvsof786c7/30510602598.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8dd3240c0---54681797427.pdfIn PDF document text
    • https://drsaman.com/files/kodibosar.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45607238752.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/95137108884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a5c5534a3---48501168724.pdfIn PDF document text
    • https://digireg.at/upload/76544204643.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a339396d045---noxutuxugijalogepivozob.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/39650984124.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/buwawinuxabelarowuduxeb.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zujeromoka.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c2962e5c---53042854327.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/fti1j6dvv1prcm83p0cqmtqsdj/buzalatodirefa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t4dkkahe0fehei0cn19v9o3kjt/worotamux.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214a58ae27---wanineporiwimuruk.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/97181479076.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_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 11040 bytes
SHA-256: a1380e1f262bda41c0c123ce803e829cbb8a3ed24f62d2f7bf05ec30b25ae5d8
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 17580 bytes
SHA-256: 92fa7103b06ec2024cbb58a26ae78025c73aa078039c1d7c99b1e12445334841
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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