Malicious PDF — malware analysis report

Static analysis result for SHA-256 7716ccf1851a7c2b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 08:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d69e31b581304a9be0091bfef84c762 SHA-1: 63a0bbe9347cedfa6ebb225ec888bbcdfc5b4f4d SHA-256: 7716ccf1851a7c2b2b32136bbbe0c6b7a91c4a7d5de09f3b475e60dcc8b572e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress sites for hosting malicious content.

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 http://strahovka66.ru/userfiles/file/17706966594.pdf In PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bawirixuwib.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/xafomojara.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/vemoliradebusimakef.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/matogodilatewogaluf.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/82197175015.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/93621011858.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/264e933f8e1f68562889dc95a9abad96/5844439723.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/28535646165.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/46008225593.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/21203188717.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/37137446769.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021950735171.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/46faa777f2f1861c6e3d24c73c410ff6/25698447779.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/31885068723.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0e01447d---wosupebipuriwuferebanemo.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/jovodag.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/13429552823.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161406378bb0c8---27469898440.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kozatagosolijezas.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/50849025347.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/913c4ef871f4b2c195fd72502e463976/wiwil.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/tojadelelukerutilokiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nikon+spot+on+for+androidPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16200 bytes
SHA-256: 41702bf819c646dd86fa83726450bc59b8414e34f05fe37ba163fd43b1a9a9b3
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10384 bytes
SHA-256: 641206d0ae4c00c951f24fdf35f4aa36441309ef0425393e63d2f34897737ba6
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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