Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b7f384d461d368…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 14:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b89da26c0ed7faac162a6b9cc14eb1e9 SHA-1: 4909976a7dd484e7a34da5a5ad01f054c48c4b6c SHA-256: 33b7f384d461d368bd40e2cea8548810b6a0502c04651d8a0ff0c4b18b3b5d62
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including one with a 'traffic race hack apk' UTM term, suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=traffic+race+hack+apk PDF link annotation
    • http://osteriadelcampanile.com/userfiles/files/faporagomugibadetofasu.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/54257081639.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/87286031271.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/wasalelepopojuwajix.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-05-29-07-55.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/39618557975.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/7266469410.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/62946298840.pdfIn PDF document text
    • http://wernitznigg.at/files/winogot.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jibubagizazuputu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0013c4ff2---62750048955.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/92458890214.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613798e0c3fc8---36715971917.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/jufapamogodasu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/75644411104.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/5440994330.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7795c59d---savelipufajoxapolo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s8ram8r80bpiabdonu6cmhpi74/xinileko.pdfIn PDF document text
    • http://feg.vn/uploads/files/43895748661.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lojilunuxusujeburejuvuj.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630651893.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/fododo.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81319394326.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/sobosazeretefabatas.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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10096 bytes
SHA-256: 4b26c84314d03c0a864e7099d1179fa9579f72a0060dd2e9acadeb69dda6b391
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 18476 bytes
SHA-256: c989d21f73b08f5909e68939846f3c37a310fa827531a09a50a210dba1476e96