Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1fd1073ac3afb9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 17:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ab697b44953e4bc09bc198aaf26f259 SHA-1: f280c0779cd1cf08ff7b57b53b5de32f22649be2 SHA-256: 7c1fd1073ac3afb9362f9b51ff2adfd3cec3e0dc26380b7e8bf5e864b495c8b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs further supports the link farm and potential tracking/phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=ejercicios+resueltos+de+cifras+significativas+y+redondeo+pdf PDF link annotation
    • http://bishnutoursandtravels.in/userfiles/file/86288772795.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/bapaxorazarisijofelip.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/jaxibobirosopujixatege.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c6aeef21add9fc9e122dc466c2e70c47/suzabuf.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829d3272af---39670260553.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91af9c564---sifed.pdfIn PDF document text
    • http://askort.pl/Upload/file/vovasojogupan.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/dugatudejesigixug.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73729233906.pdfIn PDF document text
    • http://wamer.org/userfiles/file/56476699514.pdfIn PDF document text
    • http://unsersohn.ch/images/file/naroxadonetokolo.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/54484612821.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1ed96499---44438818955.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ppg9snadbr4a3p9gfc60ifjtr7/nojefunivu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/60165872531.pdfIn PDF document text
    • http://pb-book.com/user_file/file/povexifepapifowi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1866e0012---mepagik.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/torexebevijiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace25cd9c00---befigugik.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lirukowevu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9839ad382f428259f492a533ffbbcd94/80820480001.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/lonaxetanibubaxufik.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/84464451398.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aafac132c90---woxegulelifozibigus.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4d73052ce23a80324860bded37d25b6d/jowaxo.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/68074739242.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/46073065168.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_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 18520 bytes
SHA-256: e6eb9e67f2bf71ce454a6f5944bb62d0f373ce83f53b25849934900fa5d68269
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 11188 bytes
SHA-256: 8c55314fcdbcfc5ecfa6b6728b5da7f2579b1b2260307916877a1463556f5856

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