Malicious PDF — malware analysis report

Static analysis result for SHA-256 07761773395cec63…

MALICIOUS

PDF

70.1 KB Created: 2021-08-30 13:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72d9926954dc09c278a2ed24980d4beb SHA-1: 99d1c31bfd91d508826014381407e0eaa1c3e25c SHA-256: 07761773395cec635358b4894a9a13d917600b730d8aa438c941eff83d792d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious content, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maxflowfans.com/userfiles/file/5066137840.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a7139ff6ec5cc661816711b27170a33f/wusesuligavileze.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7deca1443ecfaac0a1e2602b8278c19/40889415062.pdfIn PDF document text
    • http://markone-tools.com/upload/files/56176505134.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3jc4o4j30mdhon9maf9gdgo2e7/gitifobitowuberew.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/17f06877ac384fa22d37d46155f938ab/52947060068.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/zivepodig.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974fd680779---24356346134.pdfIn PDF document text
    • http://sdes.in/uploads/febogomidoxujiv.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a854195ee8f---widabekomesidazufibi.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/gafisotiwedemosugogamuw.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/77314369629.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d73afba3---25114370736.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/ranujuxusabuju.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/madiwogujukijamaxi.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/juruxewewa.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/mebovomumiti.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/59557396837.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bc3f0ba8---zugapalawipojo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c6ao6fc1ic6bk76fnbfj8dmbj6/jitejitokixifave.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210518/file/novudodu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jutijojudojex.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160740510a544b---wugaxawefiriwol.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce641a626---52839806676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+most+reactive+alkali+metalPDF 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_off0000b759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 10512 bytes
SHA-256: 34931ff7ad5c97e90f2cf358dd21f4f04f2acf1449931abe50cc87dfc5fe7ff1
font_02_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 14124 bytes
SHA-256: 449d0c1eb4adcd022fac21daffe5cb2ec057ec018e75bfdfaba9712860f03bce

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