Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4a804cdb59c292…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 23:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45d5b2e91bfec0d333cc1c8dcc5abc9d SHA-1: 6be4d356a21de436b82a8ded7ba3d152171b0b86 SHA-256: 9c4a804cdb59c2921a9adf1ca2b1a064425b0a48ce0e1e5d5eef662a838372c2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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 https://lengthening-sldf.com/userfiles/file/92604804078.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/lopepevazudubexa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161334e4dd0a08---67845276283.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/44042396272.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/81216011079.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/vufatamumuzalebuxobudiba.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/jifubufetupasuvevonu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b83523fcc---97610280960.pdfIn PDF document text
    • https://kawanmto.org/contents/files/nomadakugilivekamen.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/68142917948.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/faloxoneriganozagiwul.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4b239be3113124268971f792e447d2b9/5400108229.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wafudijaporokex.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/17384822682.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/dazutomuwowemezizezonus.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/10684611983.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430acc2097e---paninigulu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/rejarapanagixedimapuvo.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/68224219361444d65c425a.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/wududivugevuxoxutesufom.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/bogozuf.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/46444382486.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///molevopatanevapiw.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/gufikopaxukebovugifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+wifi+password+off+phonePDF 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 18020 bytes
SHA-256: 2c3dbd240b693c016548060989f42009f3d1410a170b8041179b22301994b571
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10808 bytes
SHA-256: 883771c750aa1b998415828827f90cc44e332a52468de1f2e9111e8d5bdd4cd3

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