Malicious PDF — malware analysis report

Static analysis result for SHA-256 165b1ce9b108363a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 02:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d3a2df3f05a6e34c090e7aed3da2954 SHA-1: 0ff3bc828771f67664eff9af58616fc74a9f8b6c SHA-256: 165b1ce9b108363a80ea703a3749cb69542315a9365352f00a828c749d5ffc91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/14497192338.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lolenamazerapowosanenora.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/tawitolukizapajesotavin.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gafogavokivifovi.pdfIn PDF document text
    • https://solturism.ro/images/file/bizewumejoridobes.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/nusekaxirupazevaso.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/86769208268.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5c76b110a1e36c6f79bcfc7e3d4531b9/nupamumuv.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/38734122559.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/purivakopagivugik.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/degabafuribivazub.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12b79b8ae---53169652010.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vasenotegunasoku.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60909341793.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/88365122476.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rarewisijufabanixof.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/papegigefivigifatesigafu.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae28604797---xifamidafuxuvaberid.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/51026297300.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/tadadesipid.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/97356587186.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/97579876258.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25209277790.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/clrie695tmn4qbub33ddh1e1i8/rowupagelanosazujagos.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133142456215---8999190642.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/mulisovelireresota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=get+data+from+pdf+to+excelPDF 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 18436 bytes
SHA-256: c7f236c963112ebe311a543d8df0c81fb58354f70644318be13bb6bc1c89ed9d
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10556 bytes
SHA-256: 34b0bad5c0971084036f44a39ae68302fe625b5bd19935892dbdbcaea8e9877c

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