Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccc4e64fa0d0436…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 12:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72d26cc1fbd9c7b17f418108283508b3 SHA-1: d311c02a3b8f475f9a2c93883a9485105567d865 SHA-256: 2ccc4e64fa0d04364f81b23e22837cf44470df907b894e871e2b65fb94d9e460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized PDF. Heuristics reveal it functions as a link farm, utilizing multiple domains, including compromised CMS uploads and disposable hosting, to obscure the ultimate destination. The presence of numerous unknown URLs suggests a broad phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://scpt.it/userfiles/files/83640636135.pdf In PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/34372836550.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8jneubi8gjfhv3p1c3igm1ed2/faxalelireko.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/durupibogosaramirul.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wuvonilitizisinazokaden.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/996ad493743a7889ab76b79c8fb6a525/vumomakod.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26d214f1c---fotumukulaju.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/nuponujemezut.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210816_0548CADDDF2D64B7.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c34b03c6e87eae8bbcfe2f90318e8e9e/91495661844.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/10793509443.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/pimut.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2jf3g0iedcjj37046ekr31n16b/zopuwogazosakutatajef.pdfIn PDF document text
    • http://leton.pl/userfiles/file/netirifikujokazimelin.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160982f1fc8bd6---tupixowev.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968a4421e29---molosadipebogunagazuni.pdfIn PDF document text
    • http://debden.org/userfiles/file/duzowuxoziparugusotu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad79a5759c0---saxokim.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pinaridewasavakosi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/5583751971.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/21409208191.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/48819225344.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/temij.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ud1ashanoo5fi3rcpuuv9uuc35/najarabod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nissan+sentra+sv+2016+manualPDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 18664 bytes
SHA-256: 9f865335bc48f66e47102a4ff4c8623cf1097c03cf1c1386c078d06e81037f2c
font_01_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10756 bytes
SHA-256: 91dc288fa7943424d5caeec2d79e50f13b3d99c4a74a2ab6d0943f71d5ab94d9
font_02_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1