Malicious PDF — malware analysis report

Static analysis result for SHA-256 610fb0bb40ed680a…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 11:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3fc2f46b24743b2af56ed1c205c2ec6 SHA-1: 4e1c0708bf51020765e04767cefb24bd4337b0ef SHA-256: 610fb0bb40ed680ab1bf10febd3d212c950f6aaf5d4f0541644071154e0f7096
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e2164297be3646622963e77310254b5a/xudolorurepadev.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c38c4ee7---31062324377.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f0ffb5d327994d192b2766cf7efdc02/tunelozu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd70a2824---pisukaduz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1a86de4f---natumurux.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/xerif.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb57e841e---xesodataxerenekirobofoka.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061623061163.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4acc581a1---rakovil.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a45b96c0d0eb89a43de8c1520e3e2a7c/41274503154.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/dajepojaguwovoxuvobuji.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e398aa2e41---27382467878.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/boxubinujarakireneg.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa684f9d8---vurukifazawe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/00c45f76b39292b7f7c122caa33bae93/gewejujigebanatomutirize.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/63940696439.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pr89vimjiu6fmp1cbo78ta34r2/gimugutadona.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6cb789082---xogitozuvarugokawew.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f10b804808389016bb1b78e7cb69aaaa/kidivorixebej.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a84c3d88041bc731ea903f3115e08381/24805555192.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608231ad6655d---nexesobuzavixizilemaraf.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/00450f795bfdbd6524642c1407b70d8a/zanovit.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1bb9f897---93668584617.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/95613444450.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lelagadesekiv.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607db64cc6fed---tuxavebojifinekogap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ts+ecet+question+papersPDF 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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16640 bytes
SHA-256: 944bd313df346da8ae10aa6620d28711f42be13f180c8ec78da8791c6378b4f3
font_01_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 10528 bytes
SHA-256: c66dac6116f6a92dfaf69bec2b6f2333176fd742884baaaf29b51bb296ff07f8