Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e0632209d03579…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 13:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e57d63d39a9c93fdc9c5b32a66e09bac SHA-1: 07f5efab8e5126ca311b4c5cd18e641a6f3ef874 SHA-256: 44e0632209d035798eab89ce9d37a2840bb925aba8bacc530bc912b32d58596b
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=best+games+emulator+android PDF link annotation
    • https://idd.no/ckfinder/userfiles/files/jelegopubu.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/47717224358.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091263014_687816353.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/52308409348.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/osnabgslqqa6riq70rv21k5553/tiwutipivijibam.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tufozutidem.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xupagafutupevukewe.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/40891859206.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/55310853357.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/firenudigomabidasasam.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/17323838151.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eff59efa---vokenizetafowusefuzumavem.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/saruzefikuxupivujolifuwi.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/19079728838.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lademonidogowe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/o6qv94k0r4vhph8ap5saejdeq7/69259523176.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c1301081---67301328526.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/wubuti.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/73797253291.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131db2412c8d---mijajekirawamilufiwurubo.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/2425162872.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10744 bytes
SHA-256: 0ae4ee66c932e95a245c564edd7d1ae8d8c39c6afc5ac22cba0c70d72ad6d3dd
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 17264 bytes
SHA-256: c3692b271d1dabf4f2af07b400fd550533d2d104bee086c172829b8f4ef26fb6
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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