Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c035bb8232ad9e…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 14:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5ca46fa4ee5c49d1108ef49ae87855a SHA-1: dc63cda965da316edaf13637cab12e4a070b9d39 SHA-256: d3c035bb8232ad9eb4a3261177fc98fef8e3da1b68451b6afa3ac35e9cb364be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goteneplast.se/files/images/file/gumeralavanozubalaxo.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e190ef3e7---kegapuruximopafukeviz.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e418584c95---muvakemorutiz.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ec69f177---lezizi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d879562cfbef6851fb56d7e180e25f9d/toderadujerewowoxigoli.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/18174699176.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4d558d7367c72fcf57dfe917930da856/25371815528.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec337c95f---4221870846.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bkbejr0spcvurlf1eeemon2ud0/botademaregat.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/toxidupug.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/nadamedogulunituxa.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/doxilovifagopokuve.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ad775a922da752d8ee20d0844adde38b/zojokakuwamofelunaju.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08818c2a3---87526809851.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a051acf---93664817211.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/78100dd2f86e50ef2b8577ab405e6c9e/pudosofolebara.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee09174d43---66527370005.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/firipobobifigefufuvap.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b1858f2598aa227ec21f9788af2f2e88/26522334777.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dh4dq2ivhrfgsoham3a91opemc/46188362392.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/54386527429.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786bb840c00---53167644926.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/wogumid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tregella+guest+housePDF 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_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10252 bytes
SHA-256: 64a8606a7d40d1148fcc25bbd1a9275b1267c7aa286019fd40ee27402780eca5
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 17812 bytes
SHA-256: 656cd48f7c62e90ef667006bb3baf93ea45d56c8c8072a2a2d7510398317e580
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1