Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39b7091e697a12…

MALICIOUS

PDF

88.1 KB Created: 2021-07-31 07:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc751ef9875d10085c019e7edcf88654 SHA-1: e89a08e08160447878732e49801f3699c21992ed SHA-256: da39b7091e697a12bf62d8f03d65c5debaf734d1ca58bbba4c29c9db8dd5aa35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=livro+pensamento+e+vida+pdf+gratis PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960e8447f2---ronusudakerew.pdfIn PDF document text
    • http://mfahk.com/upload/files/bifewuzinibigelixevizus.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/pefozebadobubozo.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/kimewawoxekedinujujis.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/19320728894.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/24qr1ad5vs94n77pq5u2n245if/donatefekavedatunuvafu.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/37773036689.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hian4bjbq91m4s2013s6dfj3l4/64998238831.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607451f4231f8---1222720016.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11a81a936---nalulaboroxupov.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56092638588.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/32472150221.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/86282760549.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e35c99e393e---84092780100.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a95e4b86---45818617353.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rq3b6oehh28brv2np7bkgdvb60/lufakapukaroxireruk.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/6805148869.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489be8dbbb---nixalekibixizavixif.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/37784725616.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/89878831736.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/korotileb.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jubiseragukof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10816 bytes
SHA-256: 0e0d191491b1267317cca35c7a251e7e9e9465487efc69ab80ca6e9ad28a4b9e
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 16988 bytes
SHA-256: 4e4b7d9456d2603b6db11a97cf2182b25d6522f21fd12523335d30dee281184f
font_02_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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