Malicious PDF — malware analysis report

Static analysis result for SHA-256 da92fec84c398b20…

MALICIOUS

PDF

105.3 KB Created: 2021-09-16 20:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7293d4063b615e3c8de02a39501b4d5 SHA-1: e39a25ea6e5457aaa53c41f932883d1bde9f2305 SHA-256: da92fec84c398b20c0e01244f795adecc9b7062d4868e40558c91bb82e03a37b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially malicious or compromised sites. Heuristics indicate a link farm on disposable hosting and compromised CMS upload storage, suggesting an attempt to distribute further malware or phishing content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=the+rise+of+atlantis+apk PDF link annotation
    • https://noble-program.site/js/ckfinder/userfiles/files/5213294583.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/86630790624.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/002aa182dbc3eb4a149c473fb5be48c7/netegelunejazuvaraba.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909205043161.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/sukefenobux.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/50192023089.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/dudalatuzobesapokat.pdfIn PDF document text
    • http://darec.sk/files/files/mubesifiwafaxerimutinimap.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/52342188790.pdfIn PDF document text
    • http://keacg.com/upload/files/furigelepukawewapetataju.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/19186632528.pdfIn PDF document text
    • http://machulski.com/public/file/duwazavewozagerimebulowok.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/30241462211.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/gimunavasolaba.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bf24fcb3a1ac72c9130860cab8bea818/54330978657.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/solububamanavomuwadis.pdfIn PDF document text
    • http://01host.ru/userfiles/files/86916942761.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a98887e7---kaxopasi.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/zagaxokixogefuzepujuk.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/bebujobudika.pdfIn PDF document text
    • http://synergyproperty.com/images/files/zurojivugukumuze.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/20698606033.pdfIn PDF document text
    • http://safarang.com/basefile/files/44027809370.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/73914378234.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05ca98c66---49098849744.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54417083576.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_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 20320 bytes
SHA-256: 7972ede694d73346959d966867b1bc847af788be57dcc3a7ea2dcf155fc5b0d8
font_01_sfnt_off00016705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1C 10512 bytes
SHA-256: 1d2ba566d4eb4affc604e3e932a59ea9a26f44fb978ccdb4eed85cad936fe66f

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