Malicious PDF — malware analysis report

Static analysis result for SHA-256 433e8eae3b547c00…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b396a3d515d35a0a9ac39f84c830501a SHA-1: 1d6e527eed26f139c0612e1b02597e7b0352b2d0 SHA-256: 433e8eae3b547c003d83ec44108cfea44a6dbd0d1ade73bcd7c74106bbff4c90
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://suthuytinh.com/app/webroot/uploads/files/gatexodovas.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4abfa72e2d974727caa6849825cc7f87/97934564181.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/rapetisejamarajotutalume.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cb860f50---76155619580.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/pepofifajogiduz.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/27311542364.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/90181744822.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l42al6gieqp6om25adsd8eclv1/jonigunuzixemepibefiw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376deff3c5d---valederavibejuzus.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/12942363711.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925423237c---netokamulijurezakidawif.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/35304492131.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/96602717897.pdfIn PDF document text
    • http://chinahongji.com/d/files/69771252482.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/xokepikojewajejupemi.pdfIn PDF document text
    • https://alev.az/userfiles/file/16021837831.pdfIn PDF document text
    • http://findacommodity.com/upload/file/30181296243.pdfIn PDF document text
    • http://dothi.info/images/files/gifulasaxekesidilur.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/jazirimapagumavevadape.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908065051.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1d3573e6---74654950812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=geocaching+mod+apkPDF 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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 10680 bytes
SHA-256: c1538e1f5811d640ad23b98821d4874e21e74087befee3a5ebcaf3cfaf3c1013
font_01_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 16460 bytes
SHA-256: 4bdf6ae1ae7e313e86b2efdc60f3e6d734b2a4baa614d97477319b5a8d900c22
font_02_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1