Malicious PDF — malware analysis report

Static analysis result for SHA-256 1deb82ef6bdf6dd7…

MALICIOUS

PDF

91.8 KB Created: 2021-09-19 03:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f45c441d506fb8726b876c64516eab9c SHA-1: 8766bfe4ff59de41e6030f5afbf9e35918a155fb SHA-256: 1deb82ef6bdf6dd7ec71d4b1206e30c1e474cd435ca859ddf35003890fb3bf89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and embedded URLs point towards an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nangluongvada.com/uploads/files/sebem.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/7479865291.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/61623007697.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ce2855e90d9767db8054c4c2b9ca1c30/fikovexanuzezisunuwawon.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/28429119269.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210914_5E89CD3B1068F28B.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/puzizasakomam.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7422ee739d71f0dd8f3af8d7bc452aae/semanom.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/32365818492.pdfIn PDF document text
    • https://majubesar.net/contents/files/nenejisal.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/gilonofaginafuzamimeduren.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rosotasipelite.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/mizabibe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f9d72fb22b254754bb8aeffc4d055ba8/zuzufifego.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/geremonupoponomegesem.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5358a3f6---78822677495.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fosasaxuzalanokowek.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/11149575523.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/3495641476.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/5913068431.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161366f74d06e2---39282210805.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/muzudekajogiriteje.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/58151265205.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_19_16_14_7233.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614047f877beb---nunisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jumanji+1+full+movie+freePDF link annotation
    • 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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10448 bytes
SHA-256: 2de167d953e96f7be7e3a955efd2db119c2842017b5dab1601630a7dfc6146d4
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 17264 bytes
SHA-256: 73b33cbdb5c6056c5011288b219e83f262fbe142e1b2f7233b2183c43700fc8e
font_02_sfnt_off000149b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1