Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d236314a9beaf08…

MALICIOUS

PDF

134.6 KB Created: 2021-06-26 04:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fef10453d34d864e69b6ae3d9e60973b SHA-1: de7b3d0d504bad12bbd2016cb9dc9a100d8dce4f SHA-256: 7d236314a9beaf08e719a6a6f26286740ff5b1344d76abae723e93d60264e866
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Blocking

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or phishing lure. Crucially, it includes an instruction to disable security software, a strong indicator of malicious activity aimed at bypassing defenses to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nomylo.ru/uplcv?utm_term=call+of+duty+modern+warfare+3+download+pc+torrent PDF link annotation
    • http://agiusfuneraldirectors.com/files/file/xebif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fac05a14---8996772173.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104291649423921.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hungaesag4ook25650a9260oaq/supusojiwur.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ffb2c2ba8f48fab11bd5c25b8339d8e1/getogu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jisubis.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/bkvcf7kqi6jd5uhu8mackoraid/22722990621.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33296fa2e---41248206118.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/kidubas.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/xodasobudavuja.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f797f70cf44ad90d74ace142c113f8b9/menisaniwuzaxirizepijana.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86373761261.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1leqji8sr1pfooif1no7v2ct92/tekuvuvawure.pdfIn PDF document text
    • https://led7.ru/file/25654179841.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa36ac809---37254625577.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089305b96699---redada.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93392341e---86450034970.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298e7216a0---bosuramunejumilotu.pdfIn PDF document text
    • http://toonesk.com/upload/88592105219.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/27108460029.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2cbb8dfc---25101824842.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec70e2062---pododurelojigugaxelupop.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s31joq2m7aur0bhv0ijosvav58/65328129146.pdfIn PDF document text
    • https://bloomeng.com/uploads/12255713547.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b99a1499---rarupidilemilomu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/58350705628.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_off0001a101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A101 21816 bytes
SHA-256: 8e19683ecfd684f6cd2eb9f3d7697bfab126dc8389def8fa1704820922b045d2
font_01_sfnt_off0001d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F07E 11024 bytes
SHA-256: 8ec409690094e9fbb8273fde461668f75abd6c29d187cb264ba8cadfac4a3c14

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