Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a7e492e1276d3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 18:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc7cfcef07bd862db0bf2a2629d9ed4a SHA-1: 7e62d6c83f8e640128b9487eb98cc48822627dde SHA-256: cf2a7e492e1276d3f37b68029f9f80924513c9dd2222b05c05f3a8020afabb7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure, as indicated by the PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggests malicious intent. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to multiple potentially compromised or malicious PDF files. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aimic.com/userfiles/file/xadokede.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9d2067eb5005716a2c725dda044a9304/nipuxajugojivepugagiko.pdfIn PDF document text
    • https://diphong.com/uploads/448583393.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210803235421.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3451dc25---lobod.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5uur1joa64j8kf5tbail4dv6m3/buveganaf.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rozarub.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/05748ebd9ff6236658def6f7c9a5c5c9/54658262304.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/liritebuvapamarozem.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/6991814099.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sukikutigedajedosi.pdfIn PDF document text
    • http://cmtsport.com/pliki/makoto.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/87339516540.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wakomowamogirimer.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fedd5080---bosorepo.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/pibanatetuvo.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/ladegiwel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d7d70cd0---74893874998.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/86873925.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/naxumilutuvovifo.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/77892391383.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/91259455309.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/rebimumojifuzidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=boss+me+25+owner%27s+manual+pdfPDF 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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 10996 bytes
SHA-256: 5af2a8e5b0cfedb0c6f1f24cf35dcafe55b125b8c189aa4380261e6e4834cd6c
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 17420 bytes
SHA-256: acdc427d795538e9caa05b420104114d5401e1a151de6dc7a107330a88eb6f4c

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