Malicious PDF — malware analysis report

Static analysis result for SHA-256 5defbbd73bdfd003…

MALICIOUS

PDF

100.6 KB Created: 2021-09-01 01:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02a18b79fb50063e90846148ed14a661 SHA-1: 2e274b2f95c660731b959f36b2c2782d69ebeb5e SHA-256: 5defbbd73bdfd0036b54fc20f1acb2939b1f244e87ce364af4a317e1f9da9980
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable binary data, indicating it is not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=cultural+displacement+gentrification PDF link annotation
    • http://3gr-group.com/ci/userfiles/files/92969122074.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/fotuduw.pdfIn PDF document text
    • http://guowangcable.com/d/files/62837579055.pdfIn PDF document text
    • https://bem-sa.com/img/file/59929271509.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/42017283423.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/toximumuzolawuxikobaxubi.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/bufezamul.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nlvvimu6vbigs7rhgufpfqbq5h/90413414139.pdfIn PDF document text
    • https://digireg.es/upload/19607701007.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbcf97128---4578735286.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f8pmmjb7d3iimnrfu54c6ti10/46143503746.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/82642841745.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609921b3c08d8---87950459180.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4e91e54f7cc4ab7c99049753ddcf78f1/gagelopipexaz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3829665cbf458db096546f292ae57658/maralupumajumixerumer.pdfIn PDF document text
    • http://xtra360.net/campannas/file/vatozewugutesedipepokumi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/86580c4340fd747aba16c38224817606/tulokoke.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609260484f52f---mozupavezetatizidiwogu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8951c7064c859da9e092b45447d01540/xiguvitufurerife.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5386f0f97b82fd1901d2739891b4ab79/18545738613.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/53f63eabb5caf163c8c541425d380753.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/58793701261.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0e4cd67e7f71f868ebcbebc89000d629/safiwugaposetisinumow.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • http://arks.princeton.edu/ark:/88435/In PDF document text
    • 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_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 11092 bytes
SHA-256: 30f67a28ccbb3499e9d26d8d2d8e105fee13357a369dfc43456bf8fac2decc5f
font_02_sfnt_off0001537d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537D 18948 bytes
SHA-256: 4ea78e38e301aea5e380cd331317421e90383f25df368d7f49677989fc1e1072

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