Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb34bd669cad6be…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 18:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc05ffd359598688de3c6f9b2967033d SHA-1: 0022a3e96ac1a01a810d05d9ad4170ce94b439ae SHA-256: 7fb34bd669cad6be7b6d59f8ba466890db3a6061e034b7076a0b94320eacfab9
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the malicious redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://atl-50.com/files/file/67834009458.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76f9586daeeca78ffe66900af5ef4066/fuvediruzitiba.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/10220541924.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/xilorazuvojomegezitudore.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077741dbaa5e---pitilipumifumukelavidem.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1m4d8il5t7dahje96l9cot5plh/30814591571.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/44341847128.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210702081357283.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fefb38ec24f653236da36670a280a50a/zidapawojow.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215201524434560.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sps0fa2h3b39s78vc198jte3o0/90647332312.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce199de654---41595193441.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/582c360c4ccba0ac1a5c9a9a2b6feffd/20932023320.pdfIn PDF document text
    • http://proxima-design.cz/files/file/55879149145.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/1555281103.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/82139183630.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-3/20210703044636507431.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3feed48e83bf4f13f5966f16dbc2ab0/pasadesobemabuvuzemabad.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/besubovuxivufetusotiza.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ebc4cb25c76a0b8720f9b90cdfdb2e5b/bedadumojanimov.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/97951225913.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/taxedojovasepibetalama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=all+parallelogram+shapesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10384 bytes
SHA-256: 698d80a1175aecad270008e2f330d3d06057acecd49b5bee3e0b4d447436f8db
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16220 bytes
SHA-256: 6489e646d18458765199a57be55f1b03d5d70d63443aaaa6399edf5f717c03ae
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 18184 bytes
SHA-256: 131fa88b2df1815ffb2c1a7e3f022dc1588dbfd7ed3926f28c6e23d219dd5d80
font_03_sfnt_off00014c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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