Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7ac28eedd0155f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 05:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41df2f279d113c6d65a5fbf694d15a50 SHA-1: bc9b05933cf8c2239bef9eb3926817f3e9c00e0a SHA-256: ac7ac28eedd0155fbd279e14882e777528575c4f4ab06e4fe417b5ecee28a626
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://korea-labels.com/ckfinder/userfiles/files/26466776945.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1frin81cisn3c8jk8pnvdvj2u4/wovukokodikevogelivama.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/wupezizuvonegibap.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8b17e3aec5923394068e5170b43fcac2/38283408891.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdfIn PDF document text
    • https://kildevangen.dk/files/jadikasukelaxofi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/20066476733.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/82183772850.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7d04s46ivuoes7mq8pdli6irj1/puwifexifoxejazumuzelade.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/mufipo.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/6453a2a91a1ae384729767c32acf4ab6/78539204061.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/rawavexikubagaso.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/tpv37gc61kmnu7grarfhv4ibd8/wujosewewolikol.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106201433560252.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3d7d74eb9399ccbaa450e094c8854a62/towoxi.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/dimegunijaruxukoleveper.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/bipudobomen.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607cccabc29bf---72703083305.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4da519bd3d030981b3c81118f4747547/95587987979.pdfIn PDF document text
    • https://morabia.fi/images/file/73680744939.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/21/file/92332819648.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judumasamadobigibixela.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/11767551709.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210817155218.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/30156725582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=disney+movie+scripts+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 10752 bytes
SHA-256: e2ab3c1c45cfbae4762d6270f024c640c2c933d1b37b81f3d36140780afd8af0
font_01_sfnt_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 16640 bytes
SHA-256: 7bf8307b18366beba269ef41efb2d6c40a20ad6efbe7799f65cd1d234c052bb9
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1