Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aa49d550c62067…

MALICIOUS

PDF

106.2 KB Created: 2021-08-03 20:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ef2f6027a9aee879eac4b760d37e645 SHA-1: d6447fe1aa399d9bbc930852ab8254657fcf5fa2 SHA-256: 66aa49d550c62067db427e9473ba28bfd09f04d1183a2752e36892928c657eba
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. These links likely serve as a lure to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91eea34df---sidojozusevitixewumun.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b61c1d7f0---92686211950.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f7009e6d---73020777897.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7aecre04qhuhitjuthhj7pkli6/fubutajifusifomugefagesew.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/90298321774.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc1a57777---53545280383.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ddef7d9b519342177b979956018baaec/42528657834.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838c51be03e---88231164256.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/78472315544.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/43524702474.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/31524846626.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/97068519908.pdfIn PDF document text
    • http://chapelguild.com/images/usr/latunigafoxe.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/48250860808.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c971875c6d---83899271240.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/76848606817.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d60bb77c225de3f1021f165acf01e7c0/51710636208.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pibewuvetapigidelatu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052810471711.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/gunigubufexu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/799e556f1cd359fd05eed48f8d544ba9/61691955074.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/vfmhqgmca6epl2vvloiikqlr7l/64233768315.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/134feh82urt4gf8jqsbblkhck8/1859925692.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/84414447938.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/67238841895.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/babowovewefiwok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rules+for+discord+servers+kawaiiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 10656 bytes
SHA-256: 07d7aa76a64cd0beb32dec3fd7d4257f75877db2dfcf9753fa4372f7aa939fcc
font_01_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 1720 bytes
SHA-256: 214ed2e2af245715abe648eb52c5324759ddcd62560140832700db3f4670389f
font_02_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 16592 bytes
SHA-256: b5bc97fe2c1b7a0109829a14a35903c8855e671f23c162ee5aebffcaa0ed6564
font_03_sfnt_off00014bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB9 20424 bytes
SHA-256: 91ecc01ff71a952661f326fd457f1bfc03ec622a7d66993331383c83d4c2af50
font_04_sfnt_off000180eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1