Malicious PDF — malware analysis report

Static analysis result for SHA-256 df79fe753922498a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 10:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7a149e103df8b00c1a23a4e90cf91b7 SHA-1: ec299c94b12ea8ee2cd97d0214e119306d51b47f SHA-256: df79fe753922498ad48c19a065b3eedf1ae26a1903299ddf8d14d1e13481111b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=delete+some+apps+on+my+phone PDF link annotation
    • http://gndpta.eu/news_objects/files/89747658263.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2309ec89---tubavuwawokediferazataxuz.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/pagolomituditinel.pdfIn PDF document text
    • http://bunian-co.com/other_files/File/goxuruwobevolenubasus.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/ketipagarobalagirifolowo.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/burerujadaxola.pdfIn PDF document text
    • https://12shio4.com/contents/files/kolosanixowi.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/vejelu.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/xanezofefu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090117523231.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zigexilefi.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/rexumisufufawazibureb.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pirujujojubixurar.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136bebc139d9---bekimoguwubedebe.pdfIn PDF document text
    • http://livestocktool.com/d/files/jakalobe.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/31273843793.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0fa3bc54227264fd2bd88bb0f7178d5b/xifawususuzepizaradobakob.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70ddc7deb---nuliwesonowefijegixo.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/buraxuxowotamejamo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/64d1f47f7dac8c5cf6487b507fac6a22/15668837064.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/61724845355.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358859a64a0---19551747006.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/72965137858.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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 15292 bytes
SHA-256: 0b78c27c752a3ad1a673552a421c6c37278067602a21123c649e4e79860aeefb
font_01_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 10440 bytes
SHA-256: 82380695c5d9f5f84fe05da981a3ebe46445f90c3ec6c7e245a96f019ebc5ae9