Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e611f4015726a7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 19:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bc4020dac66d37d08d4414b69273f21 SHA-1: b6af4833ea336da500f3753afc30993b247d747e SHA-256: 69e611f4015726a7a94d3b7b4cfb0d01a3a9eae18ac5b4cb561e702e8e53c39f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=g+words+to+describe+someone PDF link annotation
    • http://knipia.com/userfiles/file/94281508377.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907070942.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/48808344175.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/21318340381.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/sigogidatal.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/68185586849.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2bcb34a95---97570363056.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3b3fa9e4a5e755f9d2fc07c56d0b23d6/56371754725.pdfIn PDF document text
    • http://koddous.com/userfiles/file/wukomanekikigosubave.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/22836192013.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/xuziboma.pdfIn PDF document text
    • https://onlinendttraining.net/files/82173613751.pdfIn PDF document text
    • https://viceda.com/userfiles/file/99812454312.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/20510410609.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a662b5105---tisanaguroweditexiput.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c39a133ede---geluvimilamaxepafu.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/lamefukaz.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed446b0a45---7741486131.pdfIn PDF document text
    • https://dolaodong.baohohoanglong.com/userfiles/file/49889099519.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/n81bnii8cnf1obbnktkuguuv2g/poxasanefitawupevijasija.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/tobapidivowolakif.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/moziwasalapeboxemojot.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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 10588 bytes
SHA-256: b6d2118fddefa808944c1ea45ffa3c372264aa95186fc1533ca728217e89911e
font_02_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 15264 bytes
SHA-256: 0ad61a05a41b6ecace11b901f19a5e4d8b6a0124ff03199f24a476ce850f7bbe

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