Malicious PDF — malware analysis report

Static analysis result for SHA-256 167417a00c4f1809…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 19:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94dc27258bc67c6d574a96516fbd607 SHA-1: 59abf304363e81e3ab4e10637c71c3e1a3b44b06 SHA-256: 167417a00c4f1809bc3b94cc56a9522242d125ae323ec4e8c298379d12be4f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d982e230a9---92389774922.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/78hnug3pbqd31m04caacr7ao0t/40045590084.pdf
    • https://vgi-vn.vn/app/webroot/img/files/57097989451.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d72d15011574bfd8ce6c3ee4c77d0c54/sujutujuninax.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fff045301---93215070432.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cbd4df1---58709402925.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/17819347663.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/sijakizolididivilufap.pdf
    • https://growyourmoney.in/userfiles/files/nazaragoguz.pdf
    • https://bhsbeacon.com/FCKeditor/file/20236918112.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/55479103127.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32c03ae83---luvinofeviriwes.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3021077noep1dd93p0qei02941/22162791061.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/lonazolewapudojafosure.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bdijhljdnobjjntdhfaajf5m63/59770541103.pdf
    • http://dieta-plus.pl/userfiles/file/ligojumukulana.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lsm01ubkbr9uatob8c6tbg7kfg/bowofojatijanabobotedoxi.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/xagifejubi.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/duzorejakaligozuxajopuzag.pdf
    • https://homecareangels.ca/files/files/files/tunuva.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136160a14d27---11923980564.pdf
    • http://munnarinfo.in/userfiles/file/zoxuvifugujuvutadajen.pdf
    • http://zsmnowakowski.pl/userfiles/file/worigerobide.pdf
    • http://yarpb.ru/pic/userfile/tevezegubanarugevom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=get+free+passes+and+gems+on+episode
    • 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_off0000ea34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 16792 bytes
font_01_sfnt_off0001024b.bin
169e2d20f74d75db11fbf48978a3c5cbcf285cb4c7b2ded31833acd4aee18235
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10836 bytes
font_02_sfnt_off00011b11.bin
65e9fee91fe84b44ff7310f8248602488629971cd856e333ed5bcc6f5889b91f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 17184 bytes