Malicious PDF — malware analysis report

Static analysis result for SHA-256 128523c4cf2bbb24…

MALICIOUS

PDF

103.8 KB Created: 2021-07-16 02:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1eddf699d5eb192dff365fbc2dabba66 SHA-1: 4ff2ee7d730f3a2ee13fb4309c25cc8c92401562 SHA-256: 128523c4cf2bbb24d4ce29c0d9dea96d9351fed8fe651d45d0e415b92da2175d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate 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 designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/850e84a3a0860cdc48973433bb4e5729/31719194432.pdf In PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/tesedatetanatopuda.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tejh1i2l8hg2od4dvhc2fos1s1/vivigedinezi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/05bfc3c3902cf628f583898a0704515b/negazifupibo.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/42487524789.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e165b9cfd475eeb116f0f6ed37cc8af9/36096825272.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/73613819718.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec0e1e543---kisupuwupesujufotikuxav.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607131e308d03---14261535930.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mhrfdeemivi47qdduev81hn3r0/79470545726.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/53216121927.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d20cdf406---temawivaxutumikazi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d346fb1cb98165ccc75262a3b4d12d91/54602869783.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/67864909847.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f13118a14---8863931059.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021712110431890.pdfIn PDF document text
    • http://bio86.fr/fichiers/57079284124.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dotonewosuluwi.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/zofigutu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/jiviwowos.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c6718228---pasatodesofasageda.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fn8m2gatdjpcs2ecvugbssofr3/wopabe.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5044b78022fae41d348d5f3cdd2eae38/92653158685.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/57907717702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=crime+and+punishment+part+5PDF 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_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 10756 bytes
SHA-256: 8be1419d5afb7c6416d8fbc88f60b3da774c2d47cc5957f6d674337d560de4d4
font_01_sfnt_off00014dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D7 17120 bytes
SHA-256: 3eb54c574c581a4be9955254242e9f9410d45a43c53e20f6190c8915d7a0bb72

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