Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe19def3475cd19…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 00:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06007bc18763e094ca6b8ba0b9c1e8e7 SHA-1: 92f62592f296e756e9f50137b4db77d5b846b9d3 SHA-256: 1fe19def3475cd19964cd4be8f0da95ebcc4ad8da7354f965fc97281a7b18ad9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of links for potentially harmful purposes.

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://toskov-yordanov.com/userfiles/file/xifowenune.pdf In PDF document text
    • http://hflchw.com/upload/file/lekokisuradozexedoxudixob.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/jiwopegikerolofuki.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/47080665292.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zakakudemamutegivun.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161361e38d78fe---2991127339.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/24045600741.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161343eb6854a8---26720799357.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/doxowopuwonuton.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901225117254808.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/68026425307.pdfIn PDF document text
    • http://santehnika34.ru/images/file/soxufa.pdfIn PDF document text
    • https://istanajp.com/contents/files/selosezategazuzakidexup.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0beb5a33d---77451020429.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_99E0B729FC56FE85.pdfIn PDF document text
    • http://jawarakreasi.com/file/demidalesukokiruvirepis.pdfIn PDF document text
    • https://heyratacademy.ir/file/fedupiliba.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/36375578960.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/mibiresalokuzox.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/15093327204.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://strandedtattoo.info/file/64009092931.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28100971294.pdfIn PDF document text
    • https://kaparatt.com/images/File/40392726275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hidden+call+recorder+app+2021PDF 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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 17684 bytes
SHA-256: 148718aa2447ab039f89e7203982272640b16cdcb9bf41920fe1bf7079db3a27
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 10528 bytes
SHA-256: 2f4c3f94765953b8f0a49bc86c462446b76435273aef962288377c0e2bb0068a
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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