Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25e789e003eee4c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 07:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aadb0b0f53543aff45f5a5d75a041a2a SHA-1: 45977a46d98cbb098c61178de9746c7bf6c40c9d SHA-256: f25e789e003eee4c669292ef15d406c1cf5f1f6d376b115a789c98d80b8c435d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160daa64855f4c---nafarodoxetasixulodisu.pdf In PDF document text
    • http://mfahk.com/upload/files/42018979961.pdfIn PDF document text
    • http://temple.mo/userfiles/file/wurikedotikori.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mosb15jk6use11lv2nhf8q0l82/634181229.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/rejofo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8ca2352bb5f0038af5cf05dd5c1e809d/21100799197.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/kopilatafav.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/330a38e405f3969d7a30b03823a669bd/kejebixojarasawibumi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/12a08f2faa571234843e280827153b67/xarugusarogilapazabedil.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611afd19bb797---xoloriziwavedafuwiwof.pdfIn PDF document text
    • https://rintrans.com/files/28343349325.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6fb5399c---wofivoveju.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/sitalejegera.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vekawotirowosemojepifixog.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/57491130087.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/niwisuzofutuneledajoju.pdfIn PDF document text
    • http://sdds.be/userfiles/file/22819230237.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210621215512.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/surekifag.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9d879b8ae557f23153041fd19bb04e4b/folomudamekopunapopelafi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5ccac6c5167ddb1367ffefac8465be51/99578114478.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nigimipegigajajolo.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/10930886255.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/gedipupegiwajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=freerider+mobility+scooter+manualPDF 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 10864 bytes
SHA-256: a607b3222ee42c76e97d356a7a3fa3e2f4d685c64804a7c5177b4981a4569f34
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 17248 bytes
SHA-256: a6228599625cd1097a67da880a81c2707045dc2bd15f52a997aa7323fc2c92a8
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1