Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a2e6b35992b45…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 23:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f68eab0895fddc75670019ac8844400 SHA-1: d68dae4358edc8022d5ac1d84cb458d714c7242a SHA-256: 241a2e6b35992b45ed9bee1773aa25cfd8ebb75f624c1dd041ee2eee3c6101b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the final malicious destination.

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://oniceh.ru/uplcv?utm_term=edible+gold+real+gold
    • http://fqcycpa.com/jingkelun/userfiles/files/20210617224909.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ca64b54661a---rotok.pdf
    • https://emmaushuis.org/pages/71985577401.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5b2e079b67451c7d4a495d9327c7c128/36526704329.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/walatizexurunupawav.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc3a35a1f---wexewijirejajupiguwepifad.pdf
    • https://elektrona.cz/files/file/nofunikaza.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/22410167589.pdf
    • http://jrpst.pl/userfiles/file/wibamulikaxufiketegu.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160720a037761b---rofubopadoxupon.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609103f5182e9---63891284648.pdf
    • https://hunde-katzen.at/soubory/fupuxi.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb009f958---95504157593.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dmbs628mbmgllt08e5urt7ei50/gajelavewoma.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4123e2d6a0---mijaturazemafebesuvude.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/14462276061.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609846b067cdb---rokumefopoluziziwazarew.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083952dc31db---70801118234.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/98373458300.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f643210a18---43827629164.pdf
    • http://kanstm.com/ckupload/files/56256205575.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0305c672d090f2c19c2d105189c0f035/fumenijuxobisafilal.pdf
    • https://al-farh-iq.com/upload/userfiles/file/80180198030.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadc93ecfb5---linalonalomawido.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_off0000ee45.bin
7756a6b93af72107dbd9b823810f6941888735548231a76640373d7c600d2f74
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10176 bytes
font_01_sfnt_off000104cf.bin
563e4d0233708a65972e7b5795377b587d852617fd428b7544f8190b89e3c989
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17620 bytes
font_02_sfnt_off00013307.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 16792 bytes