Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdc91f0cd2bdf5e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fdae7736805432f4d1f4722d6756d25 SHA-1: 6c499533adb3f1321c3592e7ad237d42995cf357 SHA-256: 4fdc91f0cd2bdf5e0a0a5935e42ab4e0d3e0e335c41734f3b1da6bed33170f59
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate 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 drive traffic to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=boxing+babes+apk PDF link annotation
    • http://getsolarny.com/userfiles/file/ruviwexebupiziliwaza.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xoxulikugeluvi.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/nurafakoxe.pdfIn PDF document text
    • http://airzo.net/userData/board/file/48711623680.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7ldcblerg7lc6m9rdukmhb5eni/jozerize.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/pesozifisok.pdfIn PDF document text
    • https://cityface.cz/res/file/ninizovutumaxetukitipo.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/70672760633.pdfIn PDF document text
    • https://alev.az/userfiles/file/488073551.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/zejirasebosumoduxogonazap.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/11043029027.pdfIn PDF document text
    • http://xfswchem.com/upload/files/gatofubifevejebokuwipukut.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210907150046_na5gy6.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kelubusofuju.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a28b8c2534f068d5ded8fbe4bcf7e6b/22410177529.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/wefewofatetipiremifa.pdfIn PDF document text
    • https://cardolf.ro/files/9340577602.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/ketogoxuz.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zetojefibiwegeripopexawul.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/rexukiguwazokekafu.pdfIn PDF document text
    • http://aa-nusd.jp/3431883132.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361f1062c5---mizesolewexofujime.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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 17988 bytes
SHA-256: b32c8b61af6726c8381c557eb72f5aa868e411186e4521fe4f9dad07308e663f
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10572 bytes
SHA-256: 95316b41d012ed453657ff7222ba40bc62f3b463c16a0bc7c210ae0066baa49e