Malicious PDF — malware analysis report

Static analysis result for SHA-256 01955052d326e008…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 22:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67ec47c5240bea8e0e3eb7af4913a2e4 SHA-1: daaf0487e7fdd093ce219936edd3845f3fd8a54a SHA-256: 01955052d326e008a7c1ed957c1fa3291b442c1f97e5264ebc757e72a347b36d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=custom+my+location+button+android PDF link annotation
    • http://gdlejia.com/uploadfile/files/20210903_050554.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904211556237108.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/fenigiwuwomejefese.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/porimutitar.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613449afc8949---waxivirazanitujo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/selak.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tiginukenisegelojazi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jubegux.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/71032852764.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/nigagetavamelu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4243f980---36959204424.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/lotomefenidosuboso.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb79397645---kedufoniselanevoni.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/tiwugesoru.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/luxiwasoborelabati.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/25352205098.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94826b005---sodedoraxoxumelir.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42a8a13---pafivevinakijomabupewe.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/xajutaj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613844bf41243---53382050895.pdfIn PDF document text
    • https://kiptep.ru/file/bodedapegi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/dutosi.pdfIn PDF document text
    • http://spharma.ua/files/file/45422314821.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041520326490.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/1979300250.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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 17644 bytes
SHA-256: 7323639a26b64b25573cd7cefe7b6dc64ead39040aa2d6e316c397eadd2eb2d7
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10784 bytes
SHA-256: 92f26e0ca3ed30b0af8ad175b061dad4770624bb500e109959b0d5d5f8dc0ba1
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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