Malicious PDF — malware analysis report

Static analysis result for SHA-256 617b456dca50ed57…

MALICIOUS

PDF

78.4 KB Created: 2021-10-09 09:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1df7f9069095770f85b6733c1552d663 SHA-1: 5167fdec133f471268b2681943b81573ebf900cc SHA-256: 617b456dca50ed57d5b2f34c1ae5f8ae615e7c19c7d55df29043e0899877c0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content or redirect users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hondaototanan.com/upload/files/79318104272.pdf In PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/78320233492.pdfIn PDF document text
    • http://devveb.net/userfiles/file/vebif.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/kodibosunagugejufetuxede.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fitulamidukifaxejakotox.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/voxefiwewijokariketu.pdfIn PDF document text
    • http://retailcop.ca/files/zezegovonufivulilivuwig.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/92474337514.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xotuwesagebizi.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/naxopexopu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde100a1a5---32976035640.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/guzekutejavilugapodatera.pdfIn PDF document text
    • http://18554080.com/userfiles/file/sebulimilezogi.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/demupepigogavagexufexero.pdfIn PDF document text
    • http://pedraferro.com/files/files/87788716923.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/660530944.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d4957863097ee16ea59959ca46175ca/rifupawukazokefewozonoj.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/nirofi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce25232607---10217582085.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/92459661257.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/45095912178.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7230c6435---70467888913.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugodijetosizedudikimuni.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/56564089150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=about+to+croakPDF 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_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 9992 bytes
SHA-256: a2025feba7d75ce1520a4d032b2f7bf3e87f72c4394ccfa2929af41a87b8c33b
font_01_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 19176 bytes
SHA-256: c8c46a0cb1163049e1bc4f1560492d555e0d9c0fff1317a815dfefa759a21fe6
font_02_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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