Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41262becd37d022…

MALICIOUS

PDF

92.8 KB Created: 2021-07-20 10:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01e74a593b6fa6cc4fc288cda7f81414 SHA-1: 20412b6b7d344e74937b3c5a5439c3b47c4282ed SHA-256: b41262becd37d022a5e8a5c1cf71c8bbff485bfad9b56194de03774260c63337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1da3009508be8634b2f48e66ff0383a4/nujupipoxizigexivuve.pdf In PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/88767961973.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/58417764742.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4ajabopvr68fa1uoo11k6uvgr3/sufimosoparesudeporesu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a6a7b00c---nebuled.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/45148936638.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ce981d19---48791879965.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/50320568507.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e64370ae3814b6cedecf885f26e4f2a5/tisusupakegotixiw.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a9d91ea44c05a7ca7056d8840efab036/wakivajugoku.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/84206134169.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/beluze.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zujit.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tokukizel.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2opu1bjkug1f7lnerbva4gvgr0/30410633933.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bekagajadipaxezoxixi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4v9pa2atn8ebnb38882pgba6du/pewesagedo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/juzemogon.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a242634cdad---23977591794.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8ae0d6b---99152410075.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061805094273499.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/64824913758.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c692d5acd65---85227560603.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/779665fce91ce931be54565599163060/vemimozuvidal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=co+to+anionPDF 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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 22768 bytes
SHA-256: ebf1abe6b108236d4c0c496808765612a95d2c412652c11de538d1e8c3a2afa0
font_02_sfnt_off00013f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F30 3940 bytes
SHA-256: d7393928c23d65777642aaff6947d90c1f6bb690c79697bbb6e98dc4845fb256
font_03_sfnt_off00014e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E98 9688 bytes
SHA-256: 513f66c9c449713111470272cfdc2361580ef65e91215fd76ea199f4ca3b167c