Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab3d17b4d3727e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 12:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3689e5bcf4eb99a60d849c166641dd0 SHA-1: a50a432b8530c645ce98e11d0798034dc4331d2f SHA-256: 4ab3d17b4d3727e953b42879e72f93056db5d14fe7e595fe15673b71469566f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users through a chain of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=regulatory+guidelines+for+conducting+toxicity+studies+oecd+pdf PDF link annotation
    • http://ngocvietbungalow.com/upload/files/53170111874.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210629234304.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/detagofanijibutuzumepamer.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/17734143164.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/21903512465.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608560ac4e62d---78468545489.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/25453150024.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/74816477392.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/11813978710.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4fdc2426e---90357798832.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0d2d45fea2ae524a2415987a066725f/nupelo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4d23e1c4c02f185aaa98ae37f018b06c/gafipopisegejekutabiv.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/nademipupagumuxutudog.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6237e097e0---25957871639.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/gidagelelepapaneruv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/00e997035d9a647f66ecf73167cb8d9b/9757873498.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210623054301.pdfIn PDF document text
    • http://krzeptowski.pl/file/58110487425.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/2197375117.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/rabofebojuxezovegefibine.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/19352474736.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kigezi.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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 16468 bytes
SHA-256: 4585ca724948fa5056ab2ad50afda48ec5fc408b2731dfd17733f45f0b87c99c
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 11156 bytes
SHA-256: 8f18b6f1126264e4ce9a5e58b6805c391770a220c219d830ac1987dd353dcd85

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