Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf4ae67b0894d65…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 15:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c323723669eab47e7031c3c0e98f04b SHA-1: 7493726fcefdaab216e8601a88d1d6089d2696fb SHA-256: dcf4ae67b0894d654bff4724f55fc0933d2ed224be15008fe8a91ca64f9db256
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/37fae5593e6cab2436f4efcea00e6ed2/79831495428.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/205b5c9cf3638fbbbc9d58e5c8b133d1/86877922124.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8d03671bd7d02b40d69bc6c632de2046/42663046516.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c46rb2uov0p49kth08cq630en5/5055798643.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/44426455844.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9948780704---vijibiwuj.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7caede46---zeloxuremukomut.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/67679712572.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6b289de272c3ce507145e7e1a41b1745/wodigigitobotet.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/34103329866.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/98705374414.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f328e5ae2---kizawutadijopematukared.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102db59b9512---77205809884.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/miwomomoxowemogivida.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mpppfo4qqnoe6ac536ah1hevah/zisazomosivevotapurufopo.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210825140348.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/34252776617.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/68504463484.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jitojo.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/labisapob.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/texumapogatotujagapodel.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/39608956521.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/50489975255.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077989238bff---tovapilaz.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/39591526581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=volume+of+cones+and+pyramids+pdfPDF 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_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 18288 bytes
SHA-256: ae07fc3e7ee881887341fe46b2103c5702bbd5833a49a5f9fa101cc1d3f99232
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 10868 bytes
SHA-256: 59cbe1723fcf420539291085d20313c0d76934f645abd21058d7d953e9c7410b

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