Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e1ba819c171419…

MALICIOUS

PDF

94.9 KB Created: 2021-08-13 06:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 75f5e705b19e0673c9ea301919a2ecb4 SHA-1: 11c58211c137312d1b5e345052da6d41c35b892f SHA-256: 10e1ba819c1714197b54a90ed11ef1711b247952bfaf28461df2d709010686d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=vector+mechanics+for+engineers+dynamics+9th+edition+solutions+pdf PDF link annotation
    • http://elite-nails.pl/Upload/file/kanavapadetatugawerusufud.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/77171499810.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/5325135512.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/32947740459.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a26ebe878---93723776329.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/35463120172.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/dosipobafinek.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9c7a933cdd5141a23e77d943bf4d5c8/dikukababi.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/radefunikovo.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/16883622924.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/7684089753.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gopibuwapitutukiduvenol.pdfIn PDF document text
    • http://iltorg.ru/upload/file/juzedumakawujeb.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/34336600573.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2ba8e38ac3dd5a32c42000a7064c4a45/xibifewativ.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/dejeb.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f85e6bcd6---47409378583.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a235c51c4---soviboxefox.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fijudatukumofuve.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cf1b3f0852865415f63262e904b818ec/10766176280.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/05c59058a1a78e47216eb13dae43b278/50619325592.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/viwanerubutu.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_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 19392 bytes
SHA-256: 0ad8f6074e45ed552cdbda7c95511c819b0f777c14f367d55b5728f99333093a
font_01_sfnt_off00013a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A87 11420 bytes
SHA-256: 530268cfbf042ac1e2d4ae6465608b3b53233fde7795941459632e32c806752a
font_02_sfnt_off00015524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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