Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f18a839e1211c0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 05:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35190f06445c3f38c0c217776ec6a1b1 SHA-1: 3a505122d79f23e6f03b2e142f32b4be0bd00c3e SHA-256: 23f18a839e1211c07c118977cc4741bb4c3b9047d2daebd05854a585b74bb15e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or direct users to phishing or malware distribution sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://garglob.ru/uplcv?utm_term=vw+new+beetle+2003+owners+manual PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb50afbaafe291ce78888d0e8776513d/gekeragibabu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/dafunazofumabez.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/81221962921.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/93255732991.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/porazosigag.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/nofutimetikoguwedivejib.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/74126501239.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78378c463d---siremusakale.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf7db5936---vigukopomunaz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778a8b8acb9---7822769506.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073652a3b7a8---59164448832.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e57e412c3a---gunobemugexezikakadex.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/65c6e08ae44c441812f4b76474637e76/getojimofu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/14662679184.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/8468130291.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bbbcc6a1---murawiwogo.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/metolebovarok.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/vugawoka.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/anrkddfk275mebvdnani9rms5f/95706413742.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fufesiwokugewezozozebum.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/sepabofewetaranogojal.pdfIn PDF document text
    • http://santabruna.cl/upload/file/wetodufavewoxikafa.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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16932 bytes
SHA-256: 24459c29abdbfccc034383df0669d1741e61af4dfbb183d15cc0873cf01b792e
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10888 bytes
SHA-256: ad4e88c18d69c0b40cdbf39044acaad1c981facd394186e3ba85ab6acd9bc4ee
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.