Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d363a345f433a5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 11:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee8ec90765960724c5239c7d192125b3 SHA-1: 3089725543701d99f2660f19bfe4ca01afe3eb5c SHA-256: b1d363a345f433a5781381ea9662bccac02022cfa963783843bae0446854c2a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of 'SE_INVOICE_LURE' suggests a phishing pretext, aiming to trick users into clicking malicious links. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=cgst+amendment+act+2018+pdf PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mj2fgvs6f2o86o83nh47sljb53/75771262183.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/tulokozibumidiba.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/15750889514.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/55371441698.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/garebuduxegojiv.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/35499574734.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/46212362735.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mizaladetajegivegafopo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4f7fe7a312ec198ead90dbfb8ce6a2f0/madiwumeguv.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/zunumelesutawikulobi.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/9114641050.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sisogabason.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161051c1960fbc---33986413774.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/59812675243.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160743df83bcf0---girexujofejozuz.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/88882247195.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/24og12gqsf0fr16e1rc366ng8u/galepeninube.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/golukawel.pdfIn PDF document text
    • http://fygl.net/uploads/file/021105508568.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pixobumax.pdfIn PDF document text
    • https://novitas.ro/files/gezelepijananewejuzasapa.pdfIn PDF document text
    • https://daismene.it/file/16144493045.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/76463680299.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 11140 bytes
SHA-256: c56f67983c3158f6abaa7592d22766827043b8cc486ada008b2460d955c6a8ef
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 17852 bytes
SHA-256: ca1a9eff52daabb2f72432f2bae902b9086b2e147d6ce8641c6831b575ed0ef3

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