Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b631cb7d59291a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 08:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea8d6b36c4ac851a8839740c3164617f SHA-1: 8d95f2eeafaf769bd6618379ccaf921f9aa5f160 SHA-256: 72b631cb7d59291a0242b8ba5e23cfc5c3158391be25cfc798e44353b7246e23
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to other PDF files hosted on compromised websites. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=drenaje+linfatico+manual+post+liposuccion PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/fotiludog.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/ninenipekipurifig.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/10919735570.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/witiw.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/32734340543.pdfIn PDF document text
    • http://hkalc.com/userfiles/sizafomogururi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e48b20b87ce93862f7f57097ae252825/zezorobaborelabolanuxex.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/4669364408.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610577f069087---gezalimufoviv.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/888624fde69a87df3a808dfd21b7e71b/senuzojadewapapala.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/midebevod.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/14471436163.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a278c0466a6---61530614939.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161269220bf967---nexifitawopud.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/surexuxewup.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/67353297984.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d51bbb3850f39d0782d8d6724605ade9/75130357006.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/beretemu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d1bqh2744q9tru0iflbiu68bkr/juterofopelijesor.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a319b9945---roxukadolubor.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0405371a9---jujanaduvipelunufituxelow.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/49603741414.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/kixixazafiji.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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10872 bytes
SHA-256: 7dfbda8d6c7c3cb5af8a108fc4ad943196e9eede87c453bf519a01c762ce3884
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 17928 bytes
SHA-256: daa46a71c307cb4cca7e27dbec8dca1ff149745af8c5399532d35b1f8464b0ed
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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