Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53c27ec9b34cf9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 14:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf5a512d02ef9682544f2a0d354a6dd4 SHA-1: 15197d35c1c36c7bd502e199ee3b597e2dfd5b82 SHA-256: be53c27ec9b34cf94ba865e9b98cc69f43ae471529a094f631591b0b0e44f9af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ghespanail.com/fckeditor_userfiles/file/31975455442.pdf In PDF document text
    • https://swiz.eu/files/editor/nulojazivizup.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/95675399580.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zimosabavizinarotemotitu.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/47296245785.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/48788132710.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/90380490574.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/9386798824.pdfIn PDF document text
    • http://hzqzg.com/d/files/97666219707.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8e1a48a40fe849854e82db3cc665c586/98504776517.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/37ba39b4b15fa06b5bb48e54a56206b2/91413240306.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/19740295904.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/magovusokomibu.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/56570594510.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/73752223831.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/tivilavuj.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/bizutapagusodupa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ahq7bl9125phve3a5d8o7l8j4t/kegepakirigasunexinurul.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/11734608644.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/80326947818.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/89387337431.pdfIn PDF document text
    • https://thehouseproduction.net/file/xefapofedabubo.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/64625680892.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/23039148602.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c04dc82d6a7ce57470663cc01cc6d03/58585946557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=songs+played+on+ukulelePDF 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_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 18424 bytes
SHA-256: 5c433fecaaf4fccbb0d04b56c0e513e2cfecf7c875a7f3d13d5c9244693bb984
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 10656 bytes
SHA-256: 15e54fc297a70afb6b29750ac1fe7df1aaf6408f049bc632d9ed8cd2eb6195d9

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