Malicious PDF — malware analysis report

Static analysis result for SHA-256 043c000b9b0b620a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 08:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 885b3ed069653aa696b597885e20ff0a SHA-1: 306b5f5a3f0caa9fe1826550a8e2aaa8bab5a198 SHA-256: 043c000b9b0b620a3e3d3985df6fd7e1562ccde0745a18577710a6d4e14797c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for SEO poisoning. ClamAV and ML classifiers also flagged this file as malicious, specifically a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b3cfc6feb77376a2476c1d37ceb9de44/dunikemo.pdf In PDF document text
    • https://pinyardim.com/calisma2/files/uploads/pekirinesogunena.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pizafi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/uc74j8odoh80nkioro4dmn601i/64200686864.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6f844ec603484c4d36b0fe015e3ab26b/dadazozejubegoxamepusex.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/solaborumukidifad.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/pinisifov.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • https://chp-travel.ir/data/file/mozizidiboda.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/35769642307.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b751ac4ee69---vebifevonejijokelaboxij.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lijabakunezawu.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/50298363233.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bemadininikata.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebbdccbd0---sikexigatoxowudi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/47502951249.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pirozufepunaforasawu.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/17833781315.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/92084491117.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/zigunitodudeleri.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f959631eb214f1381cb8cd1c08c80465/pojepavu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/12bac6385e6b93366b75a3eea7e438b8/37994427210.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ijn2vn6dntdl887og44vrl6782/pebufowiwulojekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=american+coonhound+black+and+tanPDF 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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 17604 bytes
SHA-256: d45e891dd4e0993ced6644f15316b97e69e4e1540857dbaf37a391d8a0a810d2
font_02_sfnt_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 10780 bytes
SHA-256: 1a23d7f236b09bbaedbefdc3722c76652f4779456362c3e0a0e6411937659f3f

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