Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bf773b751238d7…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 16:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31f236abf14d33de87aaf1a2311e7454 SHA-1: fac694ce59f216e790fd64898f1d5a11b9b50f39 SHA-256: e4bf773b751238d7876eea6125f2c6c6b9942d59fa8d204d86ffc89e6fbb231c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=jurassic+world+mod+minecraft+pe PDF link annotation
    • http://www.s-prom.si/fileupload/file/38014798218.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/sowixakosalifofewixife.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/22602092086.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0d72ba9c---giwaje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ba543md35aqimmif58tk6qggp/purememazegodatonig.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23834125990.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xegedadalukipitujidif.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/51444535304.pdfIn PDF document text
    • http://freeorden.com/media/file/bojusukegozametowope.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/sadigozowanipebatok.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2ae42f00a---wipavisovowomo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tamokote.pdfIn PDF document text
    • http://lactopad.com/uploads/files/33580540535.pdfIn PDF document text
    • http://julianina.de/upload/file/25180492249.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/xoxomixus.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/41638495913.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440f67cf49d---bojakejene.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f94348c---dorovobaporivesewuwuxid.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/53526858469.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zafek.pdfIn PDF document text
    • http://swhos.com/upload/files/60854734588.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/24477691693.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_off0000ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 14856 bytes
SHA-256: 245a8e8d808762a0b79d66e21ab96c3d9a828c59eb5edc83f99f0707930093cc
font_01_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 10956 bytes
SHA-256: c4bdc57684274e3379c86f50530ea0a5749de144768b232543de17d0bf60570d
font_02_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1