Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b4ebcd2b7609a…

MALICIOUS

PDF

95.1 KB Created: 2021-07-08 02:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d293f5d6fc055a42d936f6e564d14777 SHA-1: b3d40b6a68573d20a4783b66c506d219f9054db8 SHA-256: 8c1b4ebcd2b7609a2bab427a05491742376f33235f56063eb0d4756b1eb4c596
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. These links lead to other PDF files, likely serving as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf285eb571---milisuv.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/rikakufirigeb.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lutotezijexubimexa.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fc980de5ed3d9dd37849ecb86bfab58f/josorixavofuxodikikibaw.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/236m44rmfmsbq3flrk6bnviapk/51361941174.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/28544341067.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/59635071982.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728abe37c57---debobijilivivubawusatexup.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6rrkhjj42tdlabsk7koekut5s4/35968187208.pdfIn PDF document text
    • https://anakmeong.com/contents//files/kezewegawixexamabo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/73230078286.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501054322833475.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/kadoparukadewegu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/benazejafefemedagolizur.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/pepokowerojaloporedidedu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7aa7beb28---mifusuradusomeboxetosu.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/70386419836.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2oljs3v7m645263r4bjkv76pps/90360593845.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8318a0d0c27be1ae49d605722bc7747/fuwizefoverarawuvesigu.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/mamomebobiti.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/12195869795.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5537e9ba3---lexegopipitesilunekafe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b103e4a90b6a462b6b010a2dbca15c0/fatevuje.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ba841a6e---15693541207.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee688853c---kokesipaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+take+off+the+alarm+from+clothesPDF 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_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 10576 bytes
SHA-256: f5fe37e0ca447c13f7d6370c13c24a33b105030fb1869e33acd9ec53ac71fcd3
font_01_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 17180 bytes
SHA-256: 0dfa31857aaf3ee224499661030558e314479fcb3ccdc05060c40b96de6275aa
font_02_sfnt_off000154f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1