Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae0d7ef990f7d53…

MALICIOUS

PDF

83.1 KB Created: 2021-07-07 17:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8e8d2681e324a472c77d3f70aaa88e6 SHA-1: 8a782e124360806f260d2756be6dada5cda060a7 SHA-256: 4ae0d7ef990f7d53dad2f3294feaa48d3d0e6d3cb71d9ccc43b4ec4900b32b68
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. Heuristics indicate the PDF is a link farm on disposable hosting and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of these links suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=blues+deluxe+manual PDF link annotation
    • https://zerling.eu/nico/images/files/niwipukenekigedesikuzuf.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/97681410959.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624481237.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/23408253475.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fobekokolixatilerolajef.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4k6h41k9hhstroru1dersaon11/vewigijalituwusatatetedol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/mubumuragimozewesagozeb.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c5ec140671afc58647a20b1bf2dbe5e6/nobideretitesoduve.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vulumugopopimimilite.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfc1ef2a5---84766748029.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/34741532310.pdfIn PDF document text
    • http://sns.hu/_user/file/44136562494.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/turarovuxito.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a438e0716c7729110d19bd7f9b789f11/33669512014.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/77034200092.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/196h8s9pjd6kl3gum4brr2ip7a/meduworekogomarekilafe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca6384cc---57022568805.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/712f2ac36e9e2b4ff3a8a4b258eca5b7/7542100616.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/70982794f2c6e2fe7f2cb86bc4489a8f/54698970721.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9c1397a---titisogil.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bb5b6e3b2---93755336279.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/11921527385.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p2n2qntvmlv1g84ans83uqjv0n/nelawem.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/firovenafuzuwim.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7ca11bfc---vatamekanumajimejasim.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 18284 bytes
SHA-256: f10eb12a1649e2dd27e2779381b22eb090fd7d811651142e3764225921bdd070
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 10256 bytes
SHA-256: 44b7681bbd0d814ac15357b71a1317664e716dcc63091aea6675df3ccbee56ef