Malicious PDF — malware analysis report

Static analysis result for SHA-256 e411a20b0e12d89a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 10:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d887a3ff9fce479ada7c861465713f84 SHA-1: fab611b3519b99aa1d968883e2eff9e60b9cecee SHA-256: e411a20b0e12d89a0eceb74d8671eb1f7778ffe166ab517211e039699d83cdee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the use of compromised WordPress sites for hosting malicious content, with numerous links to PDF files on such domains. The PDF itself appears to be a link farm, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9944e5d7a9---46753474057.pdf In PDF document text
    • https://comtraining.cl/userfiles/files/39068764298.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/selufewu.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/15750800894.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/fezulizamuruxekidif.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/bbf19cff742e76ca06b0b51fbc4acc41/32609363609.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/fanatisetabororotuwuze.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/64b29871ed7b843bd8af63c17df6aa0f/49495089833.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/64016959734.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607606604cd70---bufuzarejibuzij.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/woninatipobi.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/15402864958.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac254b5297ec329a52e8fa1ab5585d4b/71640624468.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/39603236123.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/wagumowukaxogizaluruwovek.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39159649246.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/87snelqf6pqlenlp0jni4rvtlc/jedojafefexi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/wesuvukulufurimizunop.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/40516681512.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a88ef138---2366632197.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/6980987306.pdfIn PDF document text
    • http://ha-sine.com/d/files/71097520938.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zeluresokelirisifemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=worksheet+writing+numbers+1-5PDF 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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 17768 bytes
SHA-256: 7076f2ec6dc5418ceaab5677c115edbc40555537fd2df4acadb7f0711a858e19
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10980 bytes
SHA-256: 63b0a4260b2803a0192a7a90a681b84d13146c12fc5c5d5fa3360872776adb64

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