Malicious PDF — malware analysis report

Static analysis result for SHA-256 997601955e3e0ac6…

MALICIOUS

PDF

141.0 KB Created: 2021-06-20 03:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e837b39b7ac8d31e82a94c4c5678585c SHA-1: 1cfdca2d37a7413d4e42e3bf9c77ae61c1730fd7 SHA-256: 997601955e3e0ac62f064d989a7a03396cb422e2d6da8eaab5ba5b222113ed8d
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=2020+wonder+woman+1984 PDF link annotation
    • http://aostavet.it/userfiles/files/dukowimokoborezeritiri.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2s9r1edbkhuv3vq8g0sa986l8f/xatefexoriluduwaporonade.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fujepome.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19f010607---35391427072.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9671579bb---89786120941.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/e96f252454c5f681c5f03cad995e0fb9/xowokefumemigijijumozu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/55225613668.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/ruzadelegijomajamemo.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2b43cc8e9c101e21d6f98da12582b470/5771957605.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ftj0quaufutkp3hre59j6goac1/34151497679.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2671424f06---zituvederej.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/7300261010.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe4c629e4---boluxorivuri.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804bb98315b---vupajafotik.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/10d876d84140345bad144773e288f9c2/budipuferemi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nelidedid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C049 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0001d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C3 5524 bytes
SHA-256: a7a0f0f7445e1c3efdab54ebe24df64387602a96c71488162920997eedc92a0a
font_02_sfnt_off0001e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E388 13588 bytes
SHA-256: 80b453308a41d4efa598c465a4272c4290bddbd96c5cf79a02dfbab7cba6a7c1
font_03_sfnt_off00020f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F8C 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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