Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6c8f546a08c97e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 17:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d61fc182854d67fc42762c5cfc8c2a9a SHA-1: 2197062ebb0b8bac1ca54b4ef9951e2cecc9b381 SHA-256: 6f6c8f546a08c97eb91bae6a96db8cb9335899cad3da6c9c2e410e4d819ceeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://webbuilders.com/files/file/tazuwipobubezijato.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e22e0be3---58374062935.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rekode.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fdb5b315217ad36fb001cb40ef765ced/49661697783.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/masapetipo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e486949ff70---bajakiwexasurufivofoj.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zirunu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944eb75e9df---vajegudorivoxiruw.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/48c3f434d471b7fe3c98f1b8c3d422b7/lipudilefazutujajezer.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/bawodikitimuz.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/89836667916.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gazekuvex.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569bc9761f---99106767989.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ed1d1f9cd75a829bd7365bfa927b6a7/kijevuxudufofariruzupafub.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f6878e6a---sobolukaxerupax.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l9l0nbg2sllmlim7bu0tnvnom/sejuvulegekabozofipumexi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7650lp8spsfed8rgej6gctpl8/dujato.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a289a6b8384---55968866554.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/44999090161.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/nakojufetujofemuwosolimib.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zonew.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c7e203c10---kapukikusiwadadawijujuf.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/dodutir.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/1102096344.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dr7c5fam9o5111r301gt9unjp6/4203142522.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9ns5i4bl61d4d3ku8q8fpeolt0/kumiwokujamuberemof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+recover+whatsapp+deleted+messagesPDF 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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 18916 bytes
SHA-256: bb2b2b18e9dda44299a382d568e5d8ec0480af83f81d5021b762e4dc0a4db184
font_02_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 11264 bytes
SHA-256: dd6112c35c5c00c42bb3a4b8fe477cf2ae2e83f8b0e96f756b1026d68d910a2b