Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b73f2a4a1b586…

MALICIOUS

PDF

77.8 KB Created: 2021-07-28 03:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d17173924909ef4ed14f4d246f843f9d SHA-1: b0d0ebd6e14b5613320badb3c4bff4f890ec6af3 SHA-256: b73b73f2a4a1b58699b393019f20d5c0e04a0518b693ffdc8bc5e6f965b641ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised CMS uploads, with one URL explicitly pointing to a PDF file. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e302430aeb---fozarikovezoravebuzadusuw.pdf
    • http://ibshop.gr/uploads/_uploads/files/fujorosedebesazajigobel.pdf
    • https://valve-toho.com/userfiles/file/37586347955.pdf
    • https://adasms.fr/userfiles/file/63989273379.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2cf19382340bf31eb47315ff5440b31e/1483514501.pdf
    • http://allmedicus.com/userfiles/file/75832852975.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1414146800609409122c524.pdf
    • https://sharadsangam.org/UserFilesTwo/file/28081096001.pdf
    • http://ecandrychow.pl/Image/files/19328281982.pdf
    • http://mnwebdesign.dk/userfiles/file/18882107698.pdf
    • https://zoldlepes.hu/userfiles/file/regefenabamirod.pdf
    • http://klefmarken.se/upload/file/97448640875.pdf
    • https://nslogisticservice.com/userfiles/files/winunu.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k7st9ai7ppp47me0h6qk9irs47/lezixoge.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/wefuz.pdf
    • http://aranykoronakft.hu/userfiles/file/bikagifivipimidamirejesir.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/26290e18ea3db9c958aaa10319b0e37c/56187833603.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/jidibixujorowiko.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/89807723218.pdf
    • https://audit-advisers.com/userfiles/file/21579445929.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dd072d3a---71772822087.pdf
    • http://axwelindia.com/uploads/66939963420.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee63dfc5259---44350200014.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u86ur1btfbkalkmuqaaitt2jr0/dumidaj.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf82620bb8c---rudix.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c000f1b972bea17d04998188e5f15e86/17050324643.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+shadow+fight+2+ios+ch%C6%B0a+jailbreak+2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c364.bin
9a98b0760cde0f144089b1eb912b1465e263f3c9c7aae12c15063b54ea7a2cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 20304 bytes
font_01_sfnt_off0000f28c.bin
dc202e3d6e71b2e99e6771160578a509a0af42c94c0621f856011f3d18aa51c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 11768 bytes
font_02_sfnt_off00010eb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 16792 bytes