Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ead8cfc407e1af…

MALICIOUS

PDF

88.3 KB Created: 2021-08-13 22:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfbb5e1ca787346e75d6e77d31eecef0 SHA-1: 321b33bffacebe88d7fda6c843960d59e82e561b SHA-256: c3ead8cfc407e1aff6936c91809dd55d7bca09a38a97a9f09486cb67f575fd20
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://an-ocn.ru/ckfinder/userfiles/files/7973046652.pdf In PDF document text
    • http://naturallabs.fr/userfiles/file/97935986912.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn9er0hopg6645mplljscnvasg/66376999657.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f943a28de11f438fee15da813593699d/lunavivapapomuvirulifom.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/564ff103a3ff24b8549e752461411ba7/57699320097.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/milopizum.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079496a58afa---60120320297.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/rowuzeruwenuzikenegevudi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ravlmureqnini308rh7cfq07k6/14758139881.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/doparado.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e15d285aa75e5451115458c8c36f073a/bovagozawulisukiliwi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7138ab722---10221527795.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3570ae52---53891502695.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab92e0428---36049391484.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d836c093---pepugokikafejebosenuzom.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8530dfc2e984763cf26e9c7feecc2e2/53334068958.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hq4as4ni0hl8se4k60vgro3u6m/19463260706.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/gexozinasovanofulafakow.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/t6rb9o73ulk6ktco3qjtn1q623/zadoxebogunezevise.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/881bbd7299ff6ae31be5f7e0abd4c322/33043560251.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a130cd5d98---xojejoravalexibezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kingroot+4.4+2+apk+downloadPDF 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_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 17404 bytes
SHA-256: c8c338770e43c0eb07c6166e82682a8dfc0a4b614a126417c168765ba609dc72
font_01_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 10700 bytes
SHA-256: 56b46afed9b1bcbb0e162157e939e90c31c415ed15391a5d58090bcffa0e336c

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