Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0e1ee585bf669f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 11:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9297bcd7a33071570ef5273d0e292754 SHA-1: 7f614bd9b69d6d9300e63a08a11188a8d66578dc SHA-256: 7a0e1ee585bf669fd2934e7138f0d5659cf4e84499af727dbd982a734f485707
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=darko+nikolic+gvozdeni+puk+pdf PDF link annotation
    • https://dcicz.org/userfiles/file/namofukivegumivodemewi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/26072e1d5ea28276606d2a36873ee7d6/xefasuwumusupog.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f3562f4a---tinepe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6d0cbeebf1c0580d6a65059bea696083/wifil.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jrt2i1knp8eukq7rvbelm4nm1h/23057561710.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/25960091401.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a0433a92---mapawebikagow.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pedujesofugepidufu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lh9mq584113kr6s8a67s5b68s2/49682271149.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/wegutameb.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/12452336853.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/wepuvagamowojibujupex.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00fb12cd1---takipudagatajivup.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xapanap.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a939c4022---jafususeratukator.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/sosufuxoripinapotimo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613208069c8f7---talifipuzifewalagi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/90074281532.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pupadadixomuzos.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/29650328784.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a779a8a51c3b797a5d2f66e39babda5e/38679735447.pdfIn PDF document text
    • http://lawngo.net/fckfiles/rezozilu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/safepujokevomu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160770e653bdfc---87574428515.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mixigonibenujaw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8rb94nj3kg25a1118pesjigfu0/66721476525.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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 22200 bytes
SHA-256: bc4d438570141f6414cf78e65aa6618c52dd83a38fdecf80a02f761effb81a4e
font_01_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 10848 bytes
SHA-256: 16d1b423c0ed6eccf982f21400c9931ed2b94bb38dd9b5eef4a9f931c79d8efa