Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efadcb8441bd38e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 06:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5496b4a79b194e98179508dc4dfe05d1 SHA-1: 1e9cffd50f7d975f6d06e3c33108694fd22ce7af SHA-256: 8efadcb8441bd38e56368364a147aea3b00ba2fff36c7e958c14b0cc73479bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable domains, which is a common tactic for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to exploit user interaction via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ruh-center.ru/userfiles/file/60931491553.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a3334d49eb048c4375023321db5c601b/timerodaloluni.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/17476218244.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mibetutisipotej.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/tidujuvifuladavijigepo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vevuvejonunewitobatidapag.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/27292026382.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zawisexabajoworewonixud.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/53437010513.pdfIn PDF document text
    • https://intersat.lv/files/file/57231877963.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/14704365426.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131512c31884---54992684046.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/maxenevuvofadewotupono.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/19897383319.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/gekofi.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/sepixukokegemanonivijuta.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wapepadigipenoxap.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vuragadijex.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/letafojum.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/85223741015.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210909084659241.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161451da73ef22---resivipuridibavaburawale.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/dipadekukakan.pdfIn PDF document text
    • https://avflash.nl/upload/files/bejivofig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+uri+get+filenamePDF 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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 15352 bytes
SHA-256: 36bbbe97b7bba0b08e186d949a7bc8d76bfd2c6fcc2ce974d8aa0fbcc761dab4
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 10612 bytes
SHA-256: 8c365c7ad1a0e8b74be6d9a7797b78cd368dbc41062eb6437e6713864bebd9b7
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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