Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebca2a4363a42a0d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 11:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55991f9c69780bb2229fec84e6d5e5f7 SHA-1: 89ec26714ebe001a946da58e3f582a0aefeb7fa3 SHA-256: ebca2a4363a42a0d650b0ecb0c710e0036e498b9ce6292fec644551ec4cc21b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://infrive.ru/uplcv?utm_term=copy+reading+exercises+pdf+filipino PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd2713620---melaxenetujurabe.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/62072671045.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/suwejasitifavasebi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/29579cb57db0abe21f79863e3e853ac9/gufewerezudumuwe.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/lajidusenotirawugavine.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/drul8irmb5v50hkuv1f7esb7e4/bitozoralivozotuvotegaf.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zurewesetizodoxiwega.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/72806390450.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/pugidujowuvifibagiwudi.pdfIn PDF document text
    • http://blatt-gruen.ch/files/wiruketapove.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b4fb1c33---vogiwazipojavixekokaloje.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xufikobujenes.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/gakelu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607908abb43bc---92328229237.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/83917737752.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ruturumesosakodizumaxeke.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/11227751668.pdfIn PDF document text
    • http://bwc.lt/i/70428836049.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/72830909682.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/kifejoxutu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tusalefawijuxexipokaniwas.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f8411f05562d2d6f66065b3e765fa229/gewubimurobifuwewanim.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 19436 bytes
SHA-256: 6dbabfb190977e641177bd0f9bd6124c2a248eda817f5d50d31b21fc9e12d95c
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10944 bytes
SHA-256: f9abd0532740ecbef899c24e33e607f202d1c9aa15eb46f624f2dba7569818ea
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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