Malicious PDF — malware analysis report

Static analysis result for SHA-256 680fbb6c0e0b1136…

MALICIOUS

PDF

84.6 KB Created: 2021-08-01 06:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc8e39f0d756c4193e8a74347e1cc019 SHA-1: 03dc5dd6fd85a69c05e1cb9816718e7ea8e12d24 SHA-256: 680fbb6c0e0b11360ed891e5515e78c7a77026e72c061f23e5e4401a345c328f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS upload directories. The embedded URLs are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

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://dcmheavyequipment.com/admin/images/file/mukasekusa.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/53888167284.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/borirarigazab.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/medulowavepigeziko.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2da0e1026b4fda182b37aa5121836e96/76551670338.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160997c15121c4---305717537.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/19196828036.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gilefovonivovuvolipadon.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/2924491766.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/b973362f844c2a7159099a8f21f7f460/nodolatu.pdfIn PDF document text
    • http://armanetti.com/images/ranexufogot.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4883ecc90a---degokegalowatedutazabit.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608528615aa1b---tabesefelomutuneto.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db280a76b14---rizekopadiwopovix.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/pemafavanonalozujad.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/eabdd1ca4434c3282adfca3c9138631f/wazabuwanokogopasizo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bulesarudogegixaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/98ea86f9762fab4e52c80945ae42e129/62856009173.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49d7eafb31---18603262246.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/70r67vaqqphf9rcpu0eo0m24bk/55228429561.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rodapelolusutiwi.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/99773726011.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/30259987641.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a110e01ea77---zifipuronevuzaraj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56823765431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+importance+of+artificial+intelligence+in+educationPDF link annotation
    • 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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16636 bytes
SHA-256: 488a25c0734baeaf771706bd031a5334688e9dc59da2f90ed2ae60dcb4b110aa
font_02_sfnt_off000133ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 10960 bytes
SHA-256: 553a6968ecaa829fd347eb97b48c6ff25bbb144a6a829c9deb9aa0b55ca62881

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