Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff612fe261fe41ce…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 210136fea2e954713826ef4bf3cd1caf SHA-1: c101539461f57e1e6105abb0b1a1034d06bbc331 SHA-256: ff612fe261fe41ce2ad31bfdcb833766ee4a7a9cded48a193de1e8560c2f1125
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of links, many of which point to potentially compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://nanobubblevietnam.com/uploads/userfiles/file/mamavugiw.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f8263408---fupobitowemumetegemo.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/sovawowupenujumiwo.pdfIn PDF document text
    • http://trieuduong.com/images/Download/94832694813.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/61594122551.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/52791461434.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/34662632560.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gixowezuzo.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/xigasobemasazovegewel.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/18920274904.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0fc2f1a970d4a644cf191c45b0bed813/miratijowelosubuj.pdfIn PDF document text
    • https://argumentua.com/i/file/zagejanilugekuvabegas.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091123003773499.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/baxuzutozikomulovu.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/18559588139.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f8af95358d693b1cdf51f77cfa40acfb/9020600174.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/38526270583.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8687e1dc9---85348325490.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xolinoxorijelawegusurale.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xotiredadigepizowewila.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/79451497710.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/babipakosetupezedaketon.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/42508149543.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/povigiwunepuwa.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/parixolunotili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nba+2k19+ppsspp+iso+file+downloadPDF 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_off0000c2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 10928 bytes
SHA-256: b63f08d41ddb45c378fd1b9cb9e3802b697c22c8c3dd1728925ce90a743e8549
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 17928 bytes
SHA-256: b2890046a400b211f9ab68dff844a90a9b4dcb345b2fe47642ecab4d92f17d12

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