Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c86b0f5c4ff3d6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 18:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0428db4d4d98fbd15d4c2d12ac8cd90f SHA-1: f40ca74b76f5dff3a149e09128f493d249f08628 SHA-256: 83c86b0f5c4ff3d6ab87ab50dc24a4433fd7bcc3a3372d9655d473f011476c61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous other PDF files hosted on compromised WordPress sites and disposable domains. The embedded JavaScript stream, though not directly analyzed for payload, further supports the malicious nature by enabling dynamic content execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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 http://z-sinpro.com/upload/files/75499952405.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780cf9a7bb5---giwemozopufobid.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7p4e3ljhn1v5g3q039n9ut89ud/tubiperojamina.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/48979375892.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/60726369880.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a7096c67---37240346498.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/495aafg3sj5v91d9rbkqudri8f/98327267016.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089296f24c7b---renevelesol.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8521927905.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/59623898689.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fenulakabakigubaketigawo.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/bepivipinogelanes.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/8952688231.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/bogojonuxixukuxozasazovag.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/98735221466.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612e013961fb9---wigitaragex.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae3e992a1f---57646850823.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d2fg3hkpgfkmig0mm8opsmf1q6/47056950715.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/61308755557.pdfIn PDF document text
    • http://mextro.de/upload/files/44168521974.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/27511022677.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607992bdad118---jofum.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/67145351385.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/50544860971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=comment+diviser+un+pdf+en+plusieurs+pagesPDF 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_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 11036 bytes
SHA-256: 2e47c1c180ba66516d84f4908d23685445dbe9498139530597a5a8956c36e1b1
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 19944 bytes
SHA-256: c5f58bef6cf4c0c462d0a473ffc3a1ca4d6cf406636809e870ec0475927c2cdb
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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