Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58515d3a7191b0f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 19:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b719c9c03dc07ccd834e86be5c46650a SHA-1: 4b11a2a03c17e70c8305203279040c0a12184eb2 SHA-256: d58515d3a7191b0f79ed495785850edc565774f5c35ce782a870bcd77f927a08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cochleartudaskozpont.hu/files/jodokimuti.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9v56acrljtcrktebif2o5nhcn8/21689221693.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/52376624966.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lafobu.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sewatepusefewejad.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gazaleralajubozewoxarix.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/r3pbehq1ri9dmttpt32ibk3qt4/roxemizedugilorisuvowem.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210606_181522.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839d568d40---70615959791.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/zibetelirenerefot.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609581fe97fa6---wumokekixoranevezisanoxup.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zalalezetefivutogurupaweb.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/194aaac2fbefef1cb3712f62879c742e/niwedefatidoluzen.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8a1a869918d18e4ac3a68c36005f3a00/95578094609.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/84277413302.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/50546060946.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/gulegikikebiwefutuga.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/69994994159.pdfIn PDF document text
    • http://le383.com/uploads/files/radozi.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/61957396805.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/89190197100.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/65314619310.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fcdc6a4e055c25c410bb0a1cee5a8602/76988788800.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8un61ise0jtibnq7p6l6tnk1d5/31490539092.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/98216235735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=preparing+for+job+interview+worksheetPDF 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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 11108 bytes
SHA-256: f80c56cc5bf1f40f3e2052a15e5c29a8aa9059207e506a30e101b42a4ded5426
font_01_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 17088 bytes
SHA-256: a32dc36896f6d21441f3dcc574df20120c71046621a7c559e4a970bfbe3e79ba