Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a1b72b1fde827…

MALICIOUS

PDF

149.3 KB Created: 2021-09-02 09:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a813079f99c57a7dc8414b3fc64987d6 SHA-1: 25739acdbfde6ca743d8e0ba4f36dc65f03135e6 SHA-256: 031a1b72b1fde827e9da1a221d47a9e56fdd65303ba812258dfce619cb26ae66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or malware distribution point. The file contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of these external links and the overall structure strongly suggest an attempt to redirect users to malicious content, potentially exploiting them via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://oniceh.ru/uplcv?utm_term=william+stallings+computer+organization+and+architecture+ppt PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3gnmetrr9e8t2its17inimu8e0/78186506633.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/49103247317.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15c023b9f---35240683593.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c02f76856ffc44a5effc928433ffe741/45772786200.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/802ccf1ce890bc4bd09e7568df2bbec6/pimikigamivoloda.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/33301252495.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lilukekawixa.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210720124632.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47a3998eb---98758917895.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d1676db9---31311394972.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/37105933973.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nojoliseve.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/3643757661.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1c6a52c948e0f2ec24805f624c496f2/renumedakalaguvajo.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/8812761605.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/67729102577.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/13420262389.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/ruborozekujuxa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e9a58864---jewofiledezivozugewoju.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/64488128814.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed5daf50194feaa8efc2a0665c318a8f/jidadidolamizifu.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/98797252251.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_off0001db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB2D 11116 bytes
SHA-256: fbc3ff8430256c327c024d09e94429f52727694c78b4731823e2451c5999c140
font_01_sfnt_off0001f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4BD 22700 bytes
SHA-256: 6e2253e95e76ea7bcfc98b2e352cc9fc07908f055c8388016c41565604b43bba
font_02_sfnt_off00022e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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