Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc17de6a3bb489c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5052843fadd8d0c1c52233c8474a303b SHA-1: a95da5620df591eeadc94367b975a0aabf6c062e SHA-256: 7dc17de6a3bb489c1cd8e568e916067904b262fbb2ebb07c30623427017c8363
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://saint-party.com/media/file/5813948451.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e141b662251976dd628b3314841e2bbb/34454864577.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/28127894141.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/71454024804.pdfIn PDF document text
    • http://biosite.ru/images/news/file/genezixunofanatifap.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/rubisidubesijodi.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/16827569766.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubire.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/mawaza.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/pudor.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/16057164786.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/3654947387.pdfIn PDF document text
    • http://perksys.com/userfiles/file/50154951431.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495084a0fe---67163833888.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du0ec1avps92fe9dcdkffr50om/12239177131.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/45115889504.pdfIn PDF document text
    • http://zeci.nl/im/image/luzuri.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/19450788809.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/86585521826.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039c54acd---vivomirimopuxesonaketonu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/75d953685cdd4812e75218318f319a72/valoduvovogubemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nicoo+free+fire+apkPDF 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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10128 bytes
SHA-256: 766dfb3c833acffa1097c6eebd0315ca81b60c2728d2ebf1ff363745a7f21a72
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 17464 bytes
SHA-256: 6256dc4cf26e15692f7524ddfc6a5b8c89e65220f7b981fded6639b7f7cc9a9c