Malicious PDF — malware analysis report

Static analysis result for SHA-256 506b3cb58c70d20a…

MALICIOUS

PDF

101.0 KB Created: 2021-07-31 00:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57e9b805d1a38bf3fdd216df83883b64 SHA-1: 1a3dfcca0cc0c9434bb4590da77c074c13cdbe7b SHA-256: 506b3cb58c70d20a6b615440d6bbef2773cebe16a9e161086a04d7088e75845a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious PDFs. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or redirection scheme designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2e9e1dffbc74617b00c77bff67f8588c/dufawuvitewuvud.pdf In PDF document text
    • https://copab.tn/216mag.svn/uploads/files/damajizifabosidugoxoxo.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fopolavi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467c6b0556---63046690044.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082761906b5f---72717140471.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/681055f1d262a6fbb788a6a591b44af5/34640165285.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e51410196555a0161fd4715b4e311af0/67192138289.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/19332013930.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/64358140584.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/86839582185.pdfIn PDF document text
    • http://allycatering.com/userfiles/vawetezusomuvok.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a43928106053cc9690589e234dac2cde/86911129360.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/78432531386.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/33911969113.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/97f9f90ae5bd2710251ee0d34cc866f7/kimosu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/71067466404.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c653f497048---kevamivalewewugufitomiro.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a06c52c05e552c463e409aa852fee715/sufebuvapawonurisexerejo.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/37669768626.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/73669108425.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ionrav6n18sdj3h93v90asnl2r/xorotugapetimase.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/zalafu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a993d2dd---64529725494.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/wetuveto.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4a9c8c8caf7ff3e86e9e4b3fc0dfdcac/rovofuxilotolikanupe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3163ce1fc6---raxudukuzivuwikiligiti.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5c4ec395fefd7a9e02268b4bf149ec45/doxakokaketam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toastmasters+table+topics+questionsPDF 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_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 10884 bytes
SHA-256: b6017527a05926879750c09b2dbe701f1f2b68a2c9f2589f0c007ac4cdb71f29
font_02_sfnt_off0001581d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581D 17272 bytes
SHA-256: 8a482bcb2426e48758658e08024836f72f4b2f7ed185a8f489a0db1dd00c4d10