Malicious PDF — malware analysis report

Static analysis result for SHA-256 933b2a19d162e816…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 05:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0b7cb3fe1e7ac198ccc8a2defc084e3 SHA-1: 76cfa65110550b415c55677599c69dff5a81adfd SHA-256: 933b2a19d162e81691ff806c31afbbfe58d4616e6c40de7efb35826f5f8e45e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=stream+soccer+match+free PDF link annotation
    • https://duongthuy.net/userfiles/file/74245047655.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/vegowovi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c26e9f3326946c426e3c426cc6926b46/55417563905.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/garagunojeraxuwosafaz.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/45137999106.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/22915833716.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/10/1974800272.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/23822446488.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133daa95d718---21253579492.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/53982944087.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sexira.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/midolaberokusebige.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3b159651---77189176302.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fiwonoxagukizojokirivun.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jbvqas6m8f9hv60m0ot2cn5386/29807548769.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312130269539.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/43086988671.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/39730034065.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bda95be0638ca930218b31cfd93c5632/nepufidusuvezexizobot.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/30406114635.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac8864eb---pobetaxovelifuzowademaze.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/jokerazineruvufonadanonuw.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/wesunujotos.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/laralejonawiwosatofe.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 19224 bytes
SHA-256: 597bf58c25e272455ec62152c33c0799af8d638b69089a7f245fd3193996752b
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 10432 bytes
SHA-256: f15b6dcbf757b4aab69586bfbba0b51d01e8103ef1a3b745b5d1839bd28087ea
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1