Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c4feef0c40acbc…

MALICIOUS

PDF

101.8 KB Created: 2021-09-04 22:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c4aee7402795801e21106d9dcdd8dbe SHA-1: 01d0a50629c53933208d264234b052991fd63ff3 SHA-256: 07c4feef0c40acbccd60f1adaaf87cca981f2e3a93cb9410a7bc6caee89276f9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing or malware distribution pages. The document body is unreadable, but the heuristic firings strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca59f8568de---82079573476.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b22f0a497---26719688805.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210528170218114.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/temojiredilifudopimeza.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/fakuvonanilemom.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9e9cfd67d4ede866b7e36d740efd79b8/folujabuxuboxisesoripa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c0a7e67b---14040466448.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210903235022.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/o30aa17pj1q4b08m7bgoslr53m/27485792639.pdfIn PDF document text
    • http://vo23.ru/upload/file/kabibafogidezokawonilan.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xaronaja.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130084b7833a---sumazitipoluju.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/89092895157.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/guzon.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b373645e---wavulivesewude.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/1684432994.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dmaued4m7f2f7mtrtun6lsljjj/xozatedatag.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/608671f136c4e4686bb85c87f98b74f7/nurijulilibabeguzokup.pdfIn PDF document text
    • https://digireg.ru/upload/zujelumovesoteper.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/59296074072.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cbba524a7---35415253835.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/59187809086.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/6962144856.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/45458491777.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/18833903239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dsm+5+pdf+completo+download+portuguesPDF 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_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 11192 bytes
SHA-256: b20a1305a53be91c837edc2373bd1b6bd047a0c00a28a8214db59a38cb81080c
font_01_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A3 20136 bytes
SHA-256: 1281480dcad9c34cee0c3551c4be5f7819676460172960261b4d5171410daf49

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