Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a4d44a5710841f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 14:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9729893118b0a8b6c38cbd526435231a SHA-1: 73228267a10c92cfbd21cbc5dc2f4c42f7a777c1 SHA-256: e9a4d44a5710841fa4a5071b4f1d73b15b918d85007affa3269026252b110308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains, likely for phishing or SEO poisoning. The PDF structure itself contains embedded links that point to these suspicious URLs, indicating an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2681acbd03---7268492350.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17a56d9c4---67597677991.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lorogizadutulaxav.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ipir7j8mpoakvde0ts13h76qo/genemejawutigu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781b335015a---28536516721.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c52141271f0---zikunomaviw.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gebexixobowutuwemevozok.pdfIn PDF document text
    • http://robedecreateur.com/img/files/voravekam.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f44893194---57207820284.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/newupebifedusifetenedoku.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/68150806377.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/zukifereninenesega.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2283108a75---48247007964.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/simoselokuvunid.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/51265678347.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1b6acfcc27217c057d5c6d2e8e779278/labiwerebinufos.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nefiruz.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/24275219702.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/favomapenoguzewibo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612d22fdab648---39736848205.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/62290825674.pdfIn PDF document text
    • http://alcantara.cz/data/file/buzumidagux.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6ac26f0a7afb96a7df4620d3944e8a78/89483742845.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/77516956745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bearing+math+worksheet+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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11128 bytes
SHA-256: 34b6700f419a9536b44d759c6d58ada9f39e4a358fdb9a390604da3f1219f76f
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 17652 bytes
SHA-256: 17fcbd8194e88d8b9ebb755559263b26be784143c1d9aab43d9a1137beb0ca65

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