Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab0478b0b161e4b…

MALICIOUS

PDF

166.8 KB Created: 2021-07-23 02:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bfb41a9eaa47c5541fa8a12293803b27 SHA-1: 688418507354bc7b3af85e76e9faa491e675b340 SHA-256: 5ab0478b0b161e4bb94f71be7891eee3426094d28efd7a188c0b345dea2bb32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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 http://datev.hu/ckfinder/userfiles/files/zomedefawuxepowugupazab.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6f636b7e---damelojazogilanefafefam.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062401485793.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/67156471572.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/44689279350.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9ed8824e58a3d0e0088a66da3305f332/kanilonizodudemelixupeda.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7fjfru7krkopra4evjhscl13q6/96710184024.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/rozusag.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fosifigijilosagot.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/dagonobora.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/24541696941.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6522ec62a---medajarejilubugabi.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fegolusuxituzaxesef.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1120dd6b8---fifigupon.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/21ad315d37f946701fa217640ebc37d0/kematuvogu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/4571498523.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/25536815565.pdfIn PDF document text
    • http://otczenacts.com/media/files/bugusokipenuzegobefi.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/7068015675.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/pogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=song+but+it+was+not+your+fault+but+minePDF 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_off00022dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DD1 17548 bytes
SHA-256: ca9a3123cb53bae86d33e7fcc62462024a5bc817a35273a2e4b7d9fe7578ee8e
font_01_sfnt_off00025b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B2B 11072 bytes
SHA-256: b2e85b88580a015fe16f985f57324dbb5590a7da8cf9e16b00f83d5bda51da54
font_02_sfnt_off0002751a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2751A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1