Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b25b19bca06c5e…

MALICIOUS

PDF

91.2 KB Created: 2021-07-06 08:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21c4df5857eab8b06e85fa674179f098 SHA-1: 1c34f90b7f4b0bcc13692ea671e418a84e37446b SHA-256: 61b25b19bca06c5e04ccc5e0dbb8b3cdac5729a9a6224e50e15ad731c6d13560
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alkalacarservice.com/public_html/userfiles/file/ziwuwu.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a6ca3c95a3c5c74dd62c714fd57caafc/buboxexelewatupodafako.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c444beabf0a---kadewizalebubidokofoso.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/6560142877.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810f611f9b8---tisepul.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1107c23b60385bfb52d88e7674bab0e1/97724647574.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0ca20beb907ed2c9e44eee1e9fb937b6/69168461240.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/85525191726.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/040411f9e8dbef5366e7812899919c44/66473591760.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/71167187971.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/govija.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/64423177801.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/wawijokibomozuvevizuxewu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d507132c6d9f6e8bd9dc014b24a39dcb/fogix.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/dd27097073baba35aa6ead8a02702326/luzasolonobedufapuvudaj.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/40887190018.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021627191114.pdfIn PDF document text
    • https://tepihtrava.rs//files/jafetufutibegutob.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/13421363659.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c61rqlosla6rqvud3468a422c/sigigupubugasiwaro.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bu8hrk4ejbpla27sqt7jioen79/83838545372.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076005b926cd---24709489933.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/18218930145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ulcer+relieved+by+foodPDF 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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 10264 bytes
SHA-256: 709f7f17c180ea80b95e911ab2fcbb0571003091f7c564b203eb54a02ee2c2d3
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 17544 bytes
SHA-256: 7e79480301d8e9a6c2306bb86eb2b23434c22e3e17373c57a2ad9fd35846dd48
font_02_sfnt_off0001465b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.