Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2df081031cb2ba…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 21:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12bade36b01cf4da2cccc2f1d727c7ab SHA-1: 0f446090e52969c83390a34f500480769e283c2c SHA-256: ce2df081031cb2ba9f352722486f7e682e2269f602d20be87673a850f68c2f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links to external websites, 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 PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://archism.ru/uplcv?utm_term=camera+mx+mod+apk+2021 PDF link annotation
    • http://logicamail.it/draft/media/jesojinimoxab.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/4322217281.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3ef3a0e8---waserakosonef.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080610386456.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/xipedowusugobuwi.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/6108493866.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/24848819035.pdfIn PDF document text
    • http://salwex.hu/file/27165034639.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/gugitetifudawexovugok.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/goninanidu.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/14104037201.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913071946546041.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/83020529715.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/52258928646.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zenerovenixarut.pdfIn PDF document text
    • https://longhoang.vn/upload/files/88725500492.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/34405677915.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/senepodefomob.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fdf6be65---gijedesuvosevo.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/dotunasunopipozumur.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/95675471872.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/35908686414.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/18323133145.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d7487897ddea64ae4841c6d73cd21829/33043458556.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 17988 bytes
SHA-256: 81d1a3916e4adf02d333b4451cafaa98d4faf3dcab61fbeadabb2ea951f16d45
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 10564 bytes
SHA-256: ec82b80dc0ac0f94758451a1b67582ee9f3603ae2428c5a03b68b9f756ba4c3b

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