Malicious PDF — malware analysis report

Static analysis result for SHA-256 7deefd68d832abb9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 15:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab15b851b3762d226aa1e524195a9f72 SHA-1: 3d4e330c43a202572b1e33fb41681261594ed81b SHA-256: 7deefd68d832abb92c52b60149ba21fd392dfbaa722244e91ab52055776c09d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nucamsa.es/userfiles/files/76744484687.pdf In PDF document text
    • https://airbays.com/userfiles/file/15667773421.pdfIn PDF document text
    • http://bptramptour.pl/files/file/50592479779.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/92577198103.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/kigekusotugesokazoje.pdfIn PDF document text
    • http://scsychem.com/upload/files/fotukitote.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/babolezasobetaf.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wowezuzijutasibezomur.pdfIn PDF document text
    • https://digicpictures.com/downloads/31856502464.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_F6A8CC8808BF06F2.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/zepemuxadusewetagibif.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/npdsiobfufkaph65gtuu9toar0/98036441697.pdfIn PDF document text
    • https://botroul.be/uploads/ketomagomilewabesemixujuz.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/31511984936.pdfIn PDF document text
    • http://cissi.it/userfiles/files/35090454171.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905060019692053.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a61c8b38---2526313485.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/8772142164.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rikepovawuzoka.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/juragaferuvuwakusokafetab.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/85584801124.pdfIn PDF document text
    • http://spharma.ua/files/file/59809743585.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/10389148634.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf92b7d45---wuxarix.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fotuzatoropekosofad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+pirate+proxy+list+2020PDF 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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10664 bytes
SHA-256: 4fc2234a87166119f45c225b12220c3ef775aaca283ac46aef5d841bbe45a4d9
font_01_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 17000 bytes
SHA-256: 413d5ef90c430c927a21a49f10ae8ff25dd5a60b690452adb0c9762c47edc754
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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