Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc12ac82b389839…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 14:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe03dfbfda00bcee0ef7e1f425a89ebc SHA-1: 735ee1c59f7154f2326da98a2f8630bd92f187e9 SHA-256: 4cc12ac82b389839486a7a689b8d3c9b6cd4d738db3df0b04911cba369ef4efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to various external URLs. Several heuristics indicate the PDF is designed to host links, with some pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=app2sd+pro+apk+no+root PDF link annotation
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/22135136427.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/13622833635.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60713851035.pdfIn PDF document text
    • https://alpinashop.bg/files/mavevolugev.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/75085002424.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xodoluwavikobinalavijak.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/jilipaxukoganosupemez.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/posebib.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5588a6b7---92640959908.pdfIn PDF document text
    • http://idcla.net/upload/files/89487281912.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2fc0600a5---golijizapeluxi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/8852686929.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/fiwixomivutofo.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/98278011379.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/29808151832.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/xewusidefenimaxi.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/19809909548.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17069822737.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/40541669981.pdfIn PDF document text
    • http://osayit.com/images/file/gajekagi.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/22419652423.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/8059302537.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/96122790111.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mojikafatotazosi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e573675ace---sanekepunusejupexexiwuwid.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF05 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_01_sfnt_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 23812 bytes
SHA-256: 97d9c8eb81435f3f114579ab4072012b8ec0f01a50fd08da4d9f40718f3be571
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 10308 bytes
SHA-256: b141be52f309398a6cb7bc3dbdfef9c9e27057c0b9f8a9d23a57f4cc4bb0206f
font_04_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838

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