Malicious PDF — malware analysis report

Static analysis result for SHA-256 162a7aa6e29b3178…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 03:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79014f3ecd7c9721f4f86c33fd968014 SHA-1: 359717a798e86b0c2bc24167869502a451176ccb SHA-256: 162a7aa6e29b31784ebe104fe1f7766b83b6148dbbdda1fa6559ce6001dc3f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=pivot+table+use+in+excel PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c8ced011---wibegofukisuxewiweku.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/98218530759.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/tevetikodoxafob.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81344cc147---85232141883.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/59341613772.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nj46ocegl6shji75sfq32vl4op/50827703788.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/51407221205.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/89478807162.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5af2ccff0502677f6bb44d54685277d5/55072694906.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///1870034046.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nadizo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6efbb46d5caa4ca955f82222e805d580/ruxadub.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xekuv.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/73032604652.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/guladusisobiwunukovovum.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b577dbbd98d---5162722020.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ditimomika.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/51665493546.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/7110801785.pdfIn PDF document text
    • https://trexanh.net/upload/files/jexubodaxajit.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091a72803fd6---16139474907.pdfIn PDF document text
    • https://tch.lu/files/files/24305698525.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/310158528964.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_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 17744 bytes
SHA-256: 5b79ea32af4f4144c36e3b639781493e842f18c37bed9b3208c9c4e8029d1a42
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10532 bytes
SHA-256: db1b21581275a8833a208eeae770e347433f779fbc2b7ec2ecd64a26bf202194