Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda8795820d3d6b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9d08e7bf964b66b689152b2d99fe2ae SHA-1: a8e0edf4e6c2c21d787c5ead227af0f75b7f1010 SHA-256: 1fda8795820d3d6b7b01952b8b25af553baefb1410d306f747e131222a95811c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=download+rozdhan+apk PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca2f6d813---zoxilatokavamoxotuw.pdfIn PDF document text
    • http://zatacorp.com/upload/files/30403874973.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/69597740590.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/viwumejukidi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/772010c1f7de4abf056f471bc915055e/saguzofavoborazatoxideb.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd373d3d89---56758419870.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/22560461266.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613464fd0a4c2---vovarividigurenobaz.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/56620446544.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/6c23f9c8697c2a53dbc2a7ab7af9bd36.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/gazitopejikuzijut.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/71888826955.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rapetotijezokofozitef.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4418590208.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/berabexa.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xibegigedogu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/62341178307.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jujufogewadiwomo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/nugoxixikodadibazaligigu.pdfIn PDF document text
    • http://hopkim.vn/upload/files/60717069615.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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 18092 bytes
SHA-256: 000630de7f0f41033954bcc4fb1f6c3ccbdef306b2cb77955908f1147d7d1d3b
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 10240 bytes
SHA-256: 0f37f2e6504823910d2e833f813aedd30420feaa9ec7fbeb304a3e0e4bed211b