Malicious PDF — malware analysis report

Static analysis result for SHA-256 416b90727c321e18…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 18:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6488109b560fd7a5bc3ab6e5c4abbf2 SHA-1: a93bba17384794ba177dcc184e0fea6ff0979491 SHA-256: 416b90727c321e184c13734166f08cffa12c8cc4d858f8df4be7da8d3494ff51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=browsec+download+apk PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7321bcf50---1168266965.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/batifezaxixadaxi.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/lijodorijavavokimetevuxox.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1q4h5gfg6eichno80vag65nkb0/20777728217.pdfIn PDF document text
    • http://htwy.com/upload/file/lopidetulapuxisogekera.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/vedesuginulolemababitir.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109132013086441.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/32430018877.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/pubatopolugijub.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631607069betef.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/24318263572.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/tawire.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/ragobetadad.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kawufemorepikabudeku.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3f5736191248b8d1be1459a917b021aa/dobepozetavitivapoxav.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/gisekubakedadoxipo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/bunaputusizelixutukeso.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/98341734623.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/53542171579.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gidanise.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32715017467.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109091002557580.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zuwujom.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/87904459956.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 17964 bytes
SHA-256: 66aa7175886b497bf9c3e248d263357effa1ddf9bd1222a400dcbd8961708655
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 10548 bytes
SHA-256: 6e63bf526fcc176f62653365bee5076854894ffa0943c50187d3cd7dc3905fa3

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