Malicious PDF — malware analysis report

Static analysis result for SHA-256 881f3b92073b187e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 16:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3772ee4f8ceac7025c3bd9930c4e81fc SHA-1: fe77200b64518743365498d569caa67ff1694eaf SHA-256: 881f3b92073b187e564e537980283f3d4e86e38a9149c2af4b1d63e5fe07ba01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions for a password-protected archive, a common tactic to bypass gateway security. Numerous URLs were extracted, many pointing to compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bertrandetgastineaudesigners.fr/userfiles/file/sodanogonigo.pdf In PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/wominuvedowakomagigosir.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/3ba4823c747e1f57b7fbf95c0e4100f7/31801061774.pdfIn PDF document text
    • http://beta-rc.com/upload/files/pifexodesumejizuxobu.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/94563753989.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/74500481000.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/fiwanuninuvoj.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sozuwegopozupokijotonomib.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/m7nsnl5n839ittvioa1lv5g52k/2762335388.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3258905b33---48379919373.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/nulivuze.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/19965917093.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081629f9b075---zomunozamifire.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/65907129997.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c898c6455de5ee5e7a30f5fbb379c9a8/xuwawekokipanemij.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/31643544550.pdfIn PDF document text
    • http://bienbao.org/uploads/files/dogumo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9kt6c1krca1e3e9lddkn3sl4h7/65248465810.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e8dcb4983a12db3b095d16711dac0faf/25649238470.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a164f15221---fosogesemalifasivupixifod.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///mabilizesufisi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0945qn05tdfc1gnu63o231p5je/84072421199.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/64371825752.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/nanadopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=makalah+manajemen+konflik+keperawatan+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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16548 bytes
SHA-256: 80f60fb2f27f5ee22c3c102e08c731412df28afccc63058c3e7e9ecec7875bc9
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 10896 bytes
SHA-256: 826f4d6adc01f11c9baa1c1593be2ab7a38980aec4b6b4ee928e209d93a18e6a

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