Malicious PDF — malware analysis report

Static analysis result for SHA-256 41624db941bfd5f4…

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 15:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55b3a2354b55881457414a97ea1d569f SHA-1: 805fcf911e5003f22d300132f21b36df15be76bd SHA-256: 41624db941bfd5f4b7498b43c63a38ec796f35334d5a75c95b8a215ad23328ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to direct users to malicious content or phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=how+do+you+change+an+excel+file+to+a+pdf PDF link annotation
    • http://sarljarry.fr/userfiles/file/losujoxujuratojux.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/filibubumetusiwimir.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/97804296829.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2be0e5af4fd678e092ad52cd55ac9f57/xumokozuwexenor.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///rokowozinaxo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1491f7ba30993f79f38692adc135a91a/25273719510.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e688294809---jiralot.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc70d8732e---75750607746.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/lafuni.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/boforiwosazuxukadimet.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7e9fa0a7ec0e2b052a1632ca0ad23e60/nolojuxaboderotemebiju.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hlkn0s19luphqcprj9v9qipea9/99891726538.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf2644f15---vemarebara.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5hk83j6iq14m14ebc8625dtto0/61908594888.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/65f52d1117d35ac72d085738c283eb4a/watabifapatakidifivipop.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/777ec834ca632d61395e2835c41625cd/vibumowiliwilemupexo.pdfIn PDF document text
    • http://flexa.cz/docs/file/govabozagebenivitud.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/89858938983.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/bixaxajopamixajujomilon.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021618346296219.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qo5fnuudcbavv3q97qle7b61v3/numikalupoziwidi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/bb1d3a93f8ce3114c4a6c47630f94aa6/78395168536.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 11024 bytes
SHA-256: e620dde9454068f44ba45f779018e9cb64882bf3563efddb6b94dccbd601694e
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 17504 bytes
SHA-256: c3ce3b3ee5a2fb9de21c30f58dc29a7342603d8a8235991cef3085213d7a9f62
font_02_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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