Malicious PDF — malware analysis report

Static analysis result for SHA-256 27362ba8c61d8895…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 13:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4960bd8b1fadb3d76b222b06d5b95636 SHA-1: e93c4e3c53123b45602bd4c4346597078c7c400c SHA-256: 27362ba8c61d8895d49c33a939a03891c4c93f8ed89ce0fc224844f7db60bf29
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://taiwanglassgroup.cn/userfiles/file/20118436910.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e32d2af57---27347859352.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/worofajolejejivisonuf.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c891312a0a---vifarenamunipag.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/60544611559.pdfIn PDF document text
    • https://inifd.london/uploads/file/tisebimazolosisojepopewin.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051817553072.pdfIn PDF document text
    • https://oversaslogistica.it/file/47524465904.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/af5a6f561619c45b7dedcd92f0225ba2/vizaro.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/93e427a363fdc2b4864a0ac428ef44bd/momil.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6osbtgvvt4mt6l6lf72nqe4e94/96372789934.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rekevixinagugefavafadu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/80e061dd4f511280b37f337f5ad7b22a/93531258518.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d41ce571---dusaduperutokozojo.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507151451.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hlp7v5uh3m606vmht5kdgajrhb/kejemaviwola.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ba2a52c3---64036036907.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5f22736b---gojowasawox.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/potoruloketunirel.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a34558bba---26285325490.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/96276095199.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/46015741083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chicago+style+title+of+book+in+textPDF 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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 17048 bytes
SHA-256: 3dcf6c83187d941ebb41d151f0a4413dd5e469200d2f1a6bc3f85ebd986ae234
font_01_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 10992 bytes
SHA-256: b8b7bf379c431e7f14db2d5a86cfecd41ecd73ee7b9247225527e457f43e3dda

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