Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c39286d5af77a4…

MALICIOUS

PDF

157.0 KB Created: 2021-07-25 18:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28a04baa3c915b35699ae1836b2d64ca SHA-1: 708815ab079c1bd88ef10ca65366d23a722a9abb SHA-256: 80c39286d5af77a48a58eaadd2dea8137b2dd0d6d3d8031f64fcb78f0e344dcc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress upload directories. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://remont-etalon.ru/upload/files/54368865475.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/zezidofifinewoduvizeg.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/74f2bff4be55b77c71026ad67809d6cd/50218514846.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/losojababedilirejoxexide.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c37475b738c---28098015183.pdfIn PDF document text
    • http://turatabor.hu/media/baditiwadikakejutu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vasawuvot.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210721_CC749F54415AA3DD.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6fbcd4c7---91738310628.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3b9aebd2---36307845375.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/vadozawixif.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/50287246786.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/t0mbjho0r35iv75mf2hatpr626/lorabikuwepejojop.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5e1834ce4815b508600129ce35435b37/2517494827.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7f5f1a723f---60066880826.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee39348c98---pagijekikadokebovidike.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec3675b4ed---52716246704.pdfIn PDF document text
    • http://dakmet.pl/upload/71775594975.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/vebapiwuvu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/62202416544.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61af28c18b---63956426057.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/kawefej.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0cbfbae974810e66fb754862c210a846/nawozej.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1ff3be9d---guxifarerobawapajeda.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f21b51aa61cce3092d89c077caa4130/mulejuxubewomos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=set+tax+on+sharp+el-1801vPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA2F 10916 bytes
SHA-256: 26709e6d283cea00664d3c654fb2b07a98c3cfe95ed858f50cfbf2031f9c63e7
font_01_sfnt_off0001f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F37D 17080 bytes
SHA-256: 2fd428458e8edd5815e4c6492cfb21a56acfe562fc1c7fb58c54baf0f08b7664
font_02_sfnt_off00020b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B38 2460 bytes
SHA-256: 10ea51863e7c721a1c34428f890871bc641fda8ac544e842f1609dc5a9a9ecf4
font_03_sfnt_off00021586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00022d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D98 20620 bytes
SHA-256: c0000f63bba460334ebf902b30d4e83f98bbfb83e9bd2744f2a9716eda14b7af

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