Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c5e67c6604470e…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 09:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbf4b0e74d4c31168fdb9df33783ff05 SHA-1: e69b1161ba77009c177328b290bcff53c72719b2 SHA-256: 41c5e67c6604470edfadf8aa2855647ccddabf300fea67b66cfe1175b6fa25d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=malaria+parasite+is+discovered+by PDF link annotation
    • http://robfredo.com/userfiles/file/tiviwuvawulew.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/92854764066.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac99e234a3---labixunanipuxadi.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/70544403761.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/nekamotemizujuguku.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/84253107530.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/77386803100.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b925daa---xidujeminadepoletamav.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5arl9vtqnng4tppidpaujoi8j/sawipadov.pdfIn PDF document text
    • http://annabarons.com/files/files/23061164320.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/92313686532.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/toduvojifusifapodewafaku.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/42896392662.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14480456575.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/56989371501.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jupisusukomonigob.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/15594671316.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lapuf.pdfIn PDF document text
    • http://posuni.com/userfiles/file/jeraxaxapetisiworawapi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161492bb07ad0f---nufozelubuzujejijosezu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lapuvipekik.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tewesefiruxe.pdfIn PDF document text
    • https://gdaniec.com/upload/files/65839158268.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xakowapugososojixojoruz.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_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 15908 bytes
SHA-256: e3c79404c5a37aeec43b58c28169a6e1ef374d6ef33860e1a3cd12a226053a40
font_01_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10716 bytes
SHA-256: 80036f2a5d67a11f1811fa4647010f7b3ac08f708bd252cc9865d3d5ea39eb05

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