Malicious PDF — malware analysis report

Static analysis result for SHA-256 d879345eef2579f0…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 18:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99faed59bfa787758a8e38109f3a7d4f SHA-1: 0e7e4756ffa62244514f2caf85eb62c0dab37b3d SHA-256: d879345eef2579f0ffa0ecc7bfe251ecc11cbf2608c8595b15dbaecc267ba499
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/63h4qb9is50ssvpq61ho238r40/50281473352.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/79833225177.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/th9liv4aoamd9k7eljupeiphh0/noxiveme.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/5364184214.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/5004285006.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/saxebakavamowex.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zobijobasab.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/85942574425.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/67344942972.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/9033172853.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/zavadedofovukuzuvavexatak.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/70babb96b54893746dc300ceb99dc583/jitotelemako.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/59469059831.pdfIn PDF document text
    • http://thongthien.vn/upload/files/59923139674.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b68b3c86bf59866aeb6638b1e496aaca/26324226782.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/46053514732.pdfIn PDF document text
    • https://isosklo.cz./uploads/80765711627.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/bafofejesedutowotapusosuj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd067dfbb6---58639877734.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb1436609---sisekupujakemamilawo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36f64b5d7---80172648862.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/10594735078.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/92747684270.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/50413392129.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cba0d654---zijololegimulip.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/rivapaliva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=schwinn+438+elliptical+manualPDF 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_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10972 bytes
SHA-256: dabe52cf531f041a3f606cc3dd4d554d96b4dbc4ff925805d768bfd2541ed00d
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 18164 bytes
SHA-256: 831abf262ff69cc1c7a8dfb3f695a72a66a1fb159a110b154e327f798ba84b93