Malicious PDF — malware analysis report

Static analysis result for SHA-256 82da96643c8a2fe8…

MALICIOUS

PDF

97.1 KB Created: 2021-08-13 21:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 94415511b94f0d052b541d03cfdcbcba SHA-1: 093d038cc453706c986009e8113fb257445afe3f SHA-256: 82da96643c8a2fe8a6c9b0b13bae29731291e5047b99b0c38501b9d0fe24eca8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://narimasu-chintai.net/jcfiles/file/22554206194.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/99897637413fddb8a73b79a8043e2755/29921221409.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc77af920---51337490597.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/045f4dde60b9a8cc01c80600e8f31c56/komoguwatitug.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/waxebenuxupewamepafof.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b5efbf79b88af23147be7859f3629f4c/tanixokipofu.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/dimojusukubikijedipejit.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6rra9q1guj330vvlbr1945061/kijelibinuke.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ac43957b---sujupigobudovenodugogudul.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/lezowiti.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/54014054242.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210705150944_2dgvh0.pdfIn PDF document text
    • https://airshow-bg.com/file/botimixok.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0b88308---93912819051.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210701235318_n3i4rr.pdfIn PDF document text
    • http://krupongs.com//images/file/tofokugoxutakomewiduka.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/tegalugakanatolowo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/4ma55icrft24jkg59ui4kv2n3a/61763784574.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/59202798528.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624349367132036892.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079cec04a14f---43113780882.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/jovanevediguwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=island+biogeography+virtual+lab+worksheet+answersPDF 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_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 11220 bytes
SHA-256: 53b233b99c22db1ae11a09e4742507aba9260b031fafcbbb7c8213d63156a2ad
font_01_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AA 17116 bytes
SHA-256: 1668e3d4bf112e22ffd72b708e0af904dc63dbefa28a7d9a84bce1526ca969f5

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