Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf20ab71a7cf13ba…

MALICIOUS

PDF

104.0 KB Created: 2021-07-07 09:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f03557ffbf781f150c397ec8a737c03 SHA-1: 61765d7b27d7bc9e48b94ac2375cb5fe81496d9f SHA-256: cf20ab71a7cf13ba16f74f11211f330ef0fd4d88cb90782d533d5e3187338d57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://krisoc.ru/uplcv?utm_term=ultimate+tower+defence+codes PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kl16uspmsio532vj1mrfrqce0m/jofofiravebofonaw.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mewag.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/537145612d4344b175fa0a8199deb649/61158151675.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4815ce219f66d43f647dc5027fdcedeb/44568760176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a392785fae---puwepibovigase.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/99867366055.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/66445229139.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e0310fbb976---nalebegiwoxifizipidu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a003bf61ce1---kupekuvalenifibep.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/dateb.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/61713e7fea758c85dacaa810deab8c0e/jakuwazese.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/leniguxerewade.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/peof43ik5qsliv3ru2e2ttg0cc/34534173524.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/7cdf379d33b2b30ac0ff5f09c726d5cd/zitafezenuwoxigonobapa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0960c9d517---kidogipokenevurovepubik.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea76992cd---dakukadepabafewurix.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/51820229901.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f0e5a4f0cffda1ee58e71355610eba88/51276408797.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c85d5b56dde541ffac6d928a37693856/43019348512.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/88949685379.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/35674009948.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/rewuwigemome.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f25ba0a0cadb0ea790c5613a4a5988c4/rivipipi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 18884 bytes
SHA-256: 7ceee6bfa9d021f1ad30c9ca35a0e7123baa17a8e55b9f4a7d7d158e5535096b
font_01_sfnt_off00014b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B42 10728 bytes
SHA-256: f61cb764a33d3c10deeaece09d87721e5b131e90a4e41cc68bc48db05ffb3180
font_02_sfnt_off000163ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C00 16340 bytes
SHA-256: 8e8a092e8af1fc7865bea808524e157a322cb113490762df22234eac747ed9ee

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