Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b198dd42ca6a6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 23:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57a345ae8873339102ad1f93f26d038c SHA-1: acaee137694937f0c10972ed24af5b44d2f7cb6e SHA-256: 745b198dd42ca6a633fd1702df712c00bfa32f78da04a3b04c11407c53d867e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=insinkerator+evolution+select+plus+installation+manual PDF link annotation
    • http://flexicourse.cz/res/file/8084258635.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/niguniravozusinikegonam.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3959db176---dumakow.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tiruruxa.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xexaxotamezuxikomafetonu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733397c5bf---21695460773.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160731dace4a48---70959793696.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/or2sp1rqsqm2lh7jbqhsgs3usp/fuxusugudinej.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc520a8f8f7---powiwaf.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/5385954659.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/67806764925.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/rewategowalas.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34fd934cad---bibubedirewetololuxiwa.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16217478879092.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/99289252894.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe747824e---visuranepi.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/felarumedunek.pdfIn PDF document text
    • http://ryokanclub.com/FileData/ckfinder/files/20210620_9E51FE063710F91E.pdfIn PDF document text
    • http://school15-tyumen.ru/f/fufowawenoserubuno.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/18040264587.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/57008487517.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gimekegige.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/49847689945.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7f2c5dd3---48248814399.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/bc55daf5a61b9d2749eed12514a33fba/letovawinugomoxelag.pdfIn PDF document text
    • 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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 10744 bytes
SHA-256: 534457857a6ae993b9848c5f3ffc904d2cdeb53945d51197507b9af1d4235906
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 17536 bytes
SHA-256: 1a1281c538cb0766f6bf8d72f7f52a8f286af56e924784e354d7d3f17389cc33

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