Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d7aa72969aa15a…

MALICIOUS

PDF

93.2 KB Created: 2021-08-08 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e347537434f5b8a5a63ce953461c1de SHA-1: 09b1a58d30567c4ab276b2afdca2d7761ece9dca SHA-256: 58d7aa72969aa15ad9d0602c0c61dee1ffb320de67f4347900f2073706bc3b9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of phishing or malware distribution campaigns. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://kirsanov-maslo.ru/uploads/66961385052.pdf In PDF document text
    • https://imagebeaute.fr/userfiles/file/perunerikikanujaju.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/74681726594.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/43644924859.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1e2e1fce0b1f7a29cb506706bcc79769/nilugedagupalaxomixunasun.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/85059725188.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4887581b5---84596196209.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/xeneruzoguratozutuweve.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/96981647042.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/madafabonafigurajifuteg.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/51877643504.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/fijup.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/kojivakodemefoxepelomal.pdfIn PDF document text
    • http://it-hair.com/userfiles/14826320708.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/pagofozivusikik.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/55d1ed632875da578a482d1fd46b7989/tedisam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e1a58b4d---mubofomunulatitasivotodo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f05146cc6c5c206d30bccd7bf64174aa/mepiravidelifexatefejode.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/tamaronafuwiroxobijojate.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/pigen.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c4953d8085292f62ece42745e23872e3/tipadivatunolukudavi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/47300a3e7f0d6cdb1157f26c63ed8c85/vijixizilonofawu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/58014601449.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/87014679385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=enzyme+activity+biology+lab+reportPDF 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_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 10912 bytes
SHA-256: 505e52979d7ff2a872cdafd9d5b9a7ed30a4f8e42111733570fc0efc6b5073b0
font_02_sfnt_off000137d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 17548 bytes
SHA-256: 981ec311eb2302efdb07a1c17bbba9272fe422a474da1ebbdba8b2db3efb7fd2

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