Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c2af8e51503af9…

MALICIOUS

PDF

102.0 KB Created: 2021-09-07 09:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2abdd712e91d3a19077f3ca022557b3 SHA-1: a9a111ef813783106d14e40ef58e226ea2e5e05f SHA-256: 27c2af8e51503af9ece9d82f3acb77dbc80df0cfd09877425f3e607f7bcca1b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cayxaotamphan.net/userfiles/image/file/36706801737.pdf In PDF document text
    • http://world-spa-resorts.com/dok/jivukigafen.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0f0e8f64---90956222914.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/55960227026.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/detoxenoge.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/somukexivowuvokokipifugum.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gpknmusfqmkj9je5fvck7u5f93/levadeg.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/52065151985.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160774d111c250---23653148825.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/43768551348.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/8374208151.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80846661790.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/mewomuvupejetefudezona.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608070784abf3---22298554446.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4cda9060f25041fc37b14ad95127ad94/lopawadezoxazeroj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29b9a3e72a---64057375718.pdfIn PDF document text
    • http://ativn.com/upload/file/watesul.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae062200462b98c052ba71c5020af4e5/sawawopewetipikijumur.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/b4rp0q1j70tga3i9gvdefo290m/51971316820.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/65134881127.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/fimolafezuvudok.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wevezofoned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ge+carescape+v100+vital+signs+monitor+manualPDF 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_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 17572 bytes
SHA-256: 31b8d56afde0651f3d2a10ac87d1b450bbec3232bd6a688e03136e64e21c6d34
font_01_sfnt_off00015866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15866 11096 bytes
SHA-256: 0fa83b60e6d162dc27a7bef19ebdb0fd7ffce91f859c444226c4ee0e68732882
font_02_sfnt_off0001724a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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