Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c62e085d23b9c7…

MALICIOUS

PDF

97.8 KB Created: 2021-08-08 22:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d843616a0f57ebf2b9e5a5bb3a47520 SHA-1: 4fcbbb4a340b8699b2d572ad29ed79606ce113cc SHA-256: d3c62e085d23b9c776aec70dc31e239f14cbcb1d568b25c9bde76849e7caef86
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71f826a01---jakonigosejugomuxu.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/mupofares.pdf
    • http://wjcopy.com/upload/files/6633156805.pdf
    • http://accessprecision.com/userfiles/file/tifiniguvejakulobivedugu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42b79b34a8b77eef0226ac5913573664/kuber.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c510181eb0a---xemaxinedimo.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/03846f39619ac65304114572c91f5eff/sovetapuxusexuridunalaxuv.pdf
    • http://www.dean-cpa.com/files/adminpic/file/mupepuviluputiruta.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/favatabezosudiga.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/9657636014.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ed85c4441d88c8eabc97d5cdc882aff2/dolivixotazotujemeteseleb.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/xukevifapu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c432dc2b---momuxiv.pdf
    • http://billedbutikken.dk/articlefiles/file/37907367078.pdf
    • http://hnc2.com/userfiles/file/nogaj.pdf
    • http://brandnewgoods.net/userfiles/file/wosudoge.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d9c0da7701686009a27ce3d81507f3ea/45543456993.pdf
    • http://royalwedding.jp/images/blog//file/5863732366.pdf
    • http://maszyny.pl/userfiles/file/36119238733.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a350c27c---19773281382.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/11015403370.pdf
    • https://vsetinrally.cz/userfiles/file/31312611647.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/23074a2e40ad10c435507c4f223ebb07/juriw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+increase+calcium+in+bones+fast
    • 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_off0001194e.bin
a0e1c9930502d927ff5b419385fe9c80fb3c228e1a563d7a691c06b71a7d1cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 17372 bytes
font_01_sfnt_off000146fc.bin
bdf4d28a6d2bdcbf8928de5a7427e653052297b5ad4626a25a7bd2f42a15e853
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 10816 bytes
font_02_sfnt_off00015ff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF4 16792 bytes