Malicious PDF — malware analysis report

Static analysis result for SHA-256 e838d5a0b33f8a2b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 17:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c59d7e1ab457b2fa5d7c0772585cf9d SHA-1: 8e879c6043d68c447f7064ac33f6e4279d02c3a0 SHA-256: e838d5a0b33f8a2b8fcd92f6261cd576ab1199897528497be2935eeaf91ab8cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the link farm strategy is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=guess+the+bts+song+by+emoji+2020 PDF link annotation
    • http://dainichiji.com/upload_ckr/files/35038953840.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/34587688164.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/26802437015.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/89529152498.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/jezavajosuporug.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/42460291531.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rasamopodizevebinuvovas.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/24940092360.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/38bfhrh87fs9i2qenkv69i0qpf/81219407644.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973c9e91c---52631601368.pdfIn PDF document text
    • https://olterus.info/contents/files/tetoxoji.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5686093934.pdfIn PDF document text
    • http://teakdeck.pl/files/file/78969193004.pdfIn PDF document text
    • https://frisch.ro/files/file/5731082097.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/84297758291.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6dbea3ca---letexuvejowiti.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gamobewe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d7e63278---wazewiregopagetonidep.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/33472674293.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/roxesebazen.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/43022130959.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusujupegokijodiforiso.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/55210315422.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398d1118f6d---90686056034.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/39953767295.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 11012 bytes
SHA-256: 3db3e2ca40a7d29b4805c9952ef4f3d772042109ba87445cf7e7098cf12562aa
font_02_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 17624 bytes
SHA-256: 2a79ffeeac2be9d0097c868c88c877a402343003b8e8a61efeef99561cb523a6

Open this report in the interactive analyzer, or submit your own file for analysis.