Malicious PDF — malware analysis report

Static analysis result for SHA-256 61344d1b5127b831…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 13:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09cece4ddedccac256cee24f81e2b6f8 SHA-1: f334995f513e653b9fc602eb64a378d993b4d33c SHA-256: 61344d1b5127b831c1d5d267f460ae5ed910855cda5d9aaadc5c3c5cf65cebe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kstarsmall.net/userfiles/file///75367164110.pdf In PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/sibalejow.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262a2452207---belepef.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/nazexowaruwufud.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nuoaarpao8osc6543kivjej59b/xagopekusejubizoxaxizeso.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vibepuzopewagebumep.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9680476f9e---85378694338.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/31375855197.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/47743901825.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3d6d12bdf459aa0de4c608e3578694f1/22247574544.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/47792034233.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/semaxatuzidebofilapu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/95836793940.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2bd4231dc0bbe642880276964638afe8/gitagusetipuxerazowoluv.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/47211208446.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/fizipe.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/78974472308.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/80572927612.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08342eb475---4023554641.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/xedetegepadimotulejogaf.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vuwazananewexegoniwu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/626945461b4eb90b5c2ce341ac08d368/kevepulita.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b331a166a390f313594d473b9386637c/24167838094.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f3177a49d97d452f9cd13aaf2eba4ad4/67604779081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clat+previous+years+solved+papers+pdfPDF 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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 10696 bytes
SHA-256: a3219c468fa664bfa5a810046d2ba3e89847a3829c8855d19c4d3ade9e7d382d
font_01_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 17484 bytes
SHA-256: 1f194696adbf5630ab9489f5a2ff4393961befb6784092974f3c8fcf28808304
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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