Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee8295faf950319…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 09:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6caead062b4b3cd5e9c99aba48aa22b1 SHA-1: 6568cd300b2d8866a3ca283575c9d745110084e5 SHA-256: 9ee8295faf950319a9783fe6b22411688228b8c61156ba39229cd5b4642bcff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to act as a lure to these external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=fast+and+furious+9+apk+download PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfd054b0ec---82075423385.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/58052374827.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7848a27122c3a00894e754ec6866d8d4/92678886308.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/ximulonume.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/jafitadetitame.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/15008715330.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mvrc00706jvhqtmvr1urh7ct9j/nidodosimukonidemikesabop.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/70686982036.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/sozikebademipalutuviker.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/mijojixepowilexuxebab.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/jinojolopikatexirobijuses.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210924223628_a2VrYXhpd3U=.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/wugurazovapitikede.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xizomegedokil.pdfIn PDF document text
    • http://bndweb.nl/upload/files/tumovifinemi.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xuvutubofake.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dosepadiv.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/37188834564.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917010043.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/mepegutidin.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/23502074822.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/15416369166.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/28954057404.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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 17464 bytes
SHA-256: 32bca64ef61a151643a7c8edcbac84b7f0581018cd5a5972ce7bffa0a3b564af
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10784 bytes
SHA-256: 6558d74d6abecc7157e833670a517b6948bff404273c210bda318945f3dc06ec

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