Malicious PDF — malware analysis report

Static analysis result for SHA-256 30033bdebf25de9b…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 788dbc9515a1d39ab1293038a4944f6e SHA-1: c99aceb65e1631e2dc9a1cb72a8320fb72164cd9 SHA-256: 30033bdebf25de9b8248fd83dea25ad7375e22d409bfc00929d37103b68c43e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URI heuristics and link farm detection rules further supports this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=iso+10006+pdf+free+download
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc302de45---paxabarataxikupapewerelit.pdf
    • https://quangcaowebsite.vn/uploads/files/83356565419.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a977b1051bf---50271634908.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vrkmpitobbet8k6ua4q9v9psml/19375604922.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a555af8d360---33789797385.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7181f898---78380043952.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082582b95267---6615556035.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/letilexoburixorubada.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63cdf40e1---25529520576.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/keximaxite.pdf
    • http://adria-ex.com/images/blog//file/51707946909.pdf
    • http://www.celso.org/download/juxonujubaxanowa.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/29416109004.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0901820db64d5f752345e6c6fd216b9/45850412976.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/01152bc1755ce89dd92d9a71dc1b0dae/guzelulugexukodaviduvim.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/663356d545a65d1853121e67cdf18ed6/71303195255.pdf
    • https://marcuspietrek.de/MARCUS/files/file/41902402964.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/81284cb0673c9a352de95f32d91ba002/jufusinojolotuwotupirat.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075792da2c34---15183934841.pdf
    • https://cvsc.co/userfiles/file/93093180612.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44f9d7e34---77947226522.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c809f4a8f8bb619326ef7f6e392bd970/losadirusabanezex.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ab4d6869edd68d5d9174245260334512/51154461501.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd2b5044c---40180836949.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/31907df3b6ddc32ff89311d97b8cb63d/61275639154.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 16792 bytes
font_01_sfnt_off00010221.bin
34a425c9e2a82dfca920a3dc7c52eaa41904d12bf38e799df56ee8ff4dfa7128
pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10680 bytes
font_02_sfnt_off00011ad6.bin
c13ee78cb228cc6eb49b29f88e68ba19c74aab65940a461cc8731bb798fe6a61
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16924 bytes