Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9437cfa3724c37a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 16:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d46f77f24532bba7cb1215cff56128a SHA-1: 8e04d029dde522d0372832b36c9bfa0844cc2e22 SHA-256: d9437cfa3724c37ae223ab78182a9e77edf95bb63089a9dccdb3d61bbe1b1991
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=windows+movie+maker+2000+free+download PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358939a174---waladinabepumosa.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/xitatejotixolegezovi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3a877700---xuwupinomi.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/92450804760.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4c31edd42dca6a179f04f88d6d228502/71643373407.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/50303848653.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/tujigu.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/velaranumotuvizovobif.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/68058041818.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/87396157686.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nidogoziwosepiwotoso.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/26339913687.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109030922009726.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/87750900276.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/85248776336.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_115010.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ff372c547a556da6d4e46d500c1e6a54/gakuwomuxabusekudugaza.pdfIn PDF document text
    • http://elitvorota.ru/f/file/96424982659.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/gogimidukazufuwapipekamot.pdfIn PDF document text
    • http://unsersohn.com/images/file/gupafinevegonun.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41728863314.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/66102501044.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8321459ad---52525415729.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16756 bytes
SHA-256: dec2bbeabc4400bf08c956bdf31f207884c70c6bddf745fccad94fcc18570de7
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 10896 bytes
SHA-256: b621f5d2d344fc8d2819910518376d60761d99651da26e330fdb50679677e201