Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac7d9435138d191…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 17:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 562b607d76a920f50077f29f44de3e03 SHA-1: 3dc4f3816176099473c48691b3e6c120f664b2aa SHA-256: 1ac7d9435138d1915b42c50973743b8d15b16ed0965e9a48cb0006c27d485eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. Heuristics and ML classifiers strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm suggest it's a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=advantages+of+iot+based+health+monitoring+system PDF link annotation
    • https://tessuno.com/upload/files/6136c1b675944.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/fiboxokires.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/lotaxifen.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/91176063890.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6174390084.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/sarig.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nugikejaziwebox.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/mibefekujijexov.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/76254024414.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/mavefikenimalat.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kenazuvogetatid.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/90991019831.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e8bb05bd8910a377508d6dfbef398a91/ranipejadobiw.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136565aefab8---badesujezari.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/ganune.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/vikuzolobodiw.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/wewexerefidirinomutufona.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/muliduzujuzufezasinowipet.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/34222145114.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/47572082795.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/fodosujolivir.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/navulegibux.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/pepez.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/dafifogekumeraxow.pdfIn PDF document text
    • 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 11104 bytes
SHA-256: 5d7e6952831332b4153039c08d5c067f249f678559e3e96a99cb8bc82f6a9e7e
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 18152 bytes
SHA-256: 946d270b50919bc7777a37f84a3909581a3b4b53371ec4679f20263eabe67346
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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