Malicious PDF — malware analysis report

Static analysis result for SHA-256 a760d3825df0053b…

MALICIOUS

PDF

87.0 KB Created: 2021-07-24 18:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b4f07e06d8533341da6970b232bacd07 SHA-1: 116d9adbe9929de376d7a0a5984f9d59297f1555 SHA-256: a760d3825df0053b079c407103654bbaffb8a8cbaa20701e58306ef0267bead4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is acting as a link farm. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914bb28a5bc---69874685497.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7c5d2c75---databurivezedu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/99898247219.pdfIn PDF document text
    • http://sparkpro.lv/content/file/40074430255.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/monubawe.pdfIn PDF document text
    • http://cycling-software.com/files/file/wujigogumekuw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1ab7041a87a4d53850bab7ae31ca7c0d/98572986453.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070694e1c2e3---sepabamog.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/35209082710.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/7052065720.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jopimoxolu.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/5943399506.pdfIn PDF document text
    • http://wawa757.com/uploads/files/34291137820.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b622c7b6174dba79fe617ba0aa0550c5/fanemorutarowebigisowir.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a040457096338bdf09eb10c04a5a3a6a/59062065644.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a668f9cec1a74e7946d44a246bf99c5f/57748137301.pdfIn PDF document text
    • https://plasy.com/uploads/file/47272043855.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e8bb42ee---82973665231.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lamadumagakunigomala.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/k05i88vssehs9c14be9j5dgol3/67199418207.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d31203eded51fb9ae417ae43f212959/48119896765.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/nubezete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sat+math+level+1+practice+test+pdf+with+answersPDF 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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 11044 bytes
SHA-256: cff884f529041283975238abe0932c28336f4b0f9b9532425c4c4e40963c8db3
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 18012 bytes
SHA-256: 81feb1dcd32c1d26d0dcd6f5a473978289898647d5c03bc227728325350f05ac
font_02_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1