Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72573ca353c62cf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 17:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 658356367d53b8e3ff0214a1d1561ac0 SHA-1: ecfbceb119edf66670986d6a47ff01295bfb7c98 SHA-256: d72573ca353c62cfb782df689cfefeb7600f2b75f7f3cc214d18b9805169e96e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=redecor+game+mod PDF link annotation
    • http://tehla.eu/userfiles/file/81494088342.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/waligef.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/628dfc6fab80b3f6159e28a7dfb9e3d8/rubamebejadutevekatul.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/ditofepasemosudezubo.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/sefob.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/goxedativorapodevuwonapem.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/gidoxuvu.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/4860618295.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/23418308370.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vesaxubalate.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/26052792468.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/javoremexisariniwenire.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/27256777887.pdfIn PDF document text
    • https://bak.vn/upload/files/13992380923.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/geraxixo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/riwixutovogasu.pdfIn PDF document text
    • http://www.centralperdana.com/file/78173335719.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8ec410e283ca74a1f337b54237cf4232/funomufinepulagofilixesej.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/pejolu.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/gogumofanobofamip.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/81196633714.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed70dc72cc---nalefuxugijiditiwuzipavu.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/21448272953.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/41645683119.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/4217555340.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/tixapijemine.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402ce27675f---jivapogafitobotoxitexaxi.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 17396 bytes
SHA-256: 46a1537266e3e9e2a8271c48bfbb9c0f3873e59310cf2fdad4c15fb487a195bf
font_01_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 10248 bytes
SHA-256: 0ffe5366c20052eb15ab4498b6df9c012a82f4ead34007c38c7a49cb0b11f703
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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