Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac55216cde5b43d3…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 00:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e059cda4474626aed1c8c38f8a0a3ce SHA-1: e9d9810c4c4f07bf14bee505bb3871fdda2a2561 SHA-256: ac55216cde5b43d3b8f34e2eef399dff943fb59e569b1f80e2fb9954fb7213d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'root android 8.0 apk' in its query parameter indicates a potential lure for malicious Android applications. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=root+android+8.0+apk PDF link annotation
    • https://calprin.com/ckfinder/userfiles/files/gejupomaxeluturumojivukow.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bezusoxefo.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/85878916249.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/60845666869.pdfIn PDF document text
    • http://samtekelektrik.com/files/binipituvuvobidafitemuren.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/pikogijuvubomoxizejuzut.pdfIn PDF document text
    • http://hoachattn.com/image/files/66100718631.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fipotorufadulu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/30244ba2577620be255c8007c556811c/94564145439.pdfIn PDF document text
    • http://geraldinekilkelly.ie/42603096335.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/41850319962.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/wukizolukunugodapazim.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/56d9b2d86aa01204da0a74f8260c3e8b/fewuke.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdfIn PDF document text
    • http://tzsunup.com/upload/navureravasojewiwowulozu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/59248326740.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912230659510557aspesbg3o1xg.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/73375533375.pdfIn PDF document text
    • http://turatabor.hu/media/xesoberalefimebe.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/mefavelagotasofavumafuxo.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/68269552333.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/93091244870.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/88001770123.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/94713548139.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fdf509e5e---5748078264.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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 10572 bytes
SHA-256: 42998477498a68fef429698ac94d7c6b2058535dcc90fb57fa47fddf3f59ce58
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 18700 bytes
SHA-256: a8be8480c5df7e5ff98269842d8fe85a68762895bb6e68de64707dcf52ddd065

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