Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115a024b98e88d2…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 00:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a50f42780e88d5e1d021a604a254f9b SHA-1: 5c4672ba4364de01e6df8110759ce551e9bdb573 SHA-256: c115a024b98e88d2d33acb0f6e50dbb7fe155cc00f0ba05ced6ce87673f5fa7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://coretry.ru/uplcv?utm_term=crazy+love+free+pdf PDF link annotation
    • https://vegan-eshop.cz/data/file/sogew.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/82124965800.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/ziwubafewunobadejusudejon.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/60429907280.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/63170018275.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7831b78f3---bosinite.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/91140628682.pdfIn PDF document text
    • https://arerp.kr/data/file///mipif.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/5763896249.pdfIn PDF document text
    • http://livestocktool.com/d/files/42227418175.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/pexovukop.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/gevufozopikag.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/7954710934.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/83967574564.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346200321b2---54682762182.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd15b15c7---ledexivefixufobososi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rigizawojegonewutagimojuv.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/lasudevoponipebefapidaxem.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/zekizazolinafem.pdfIn PDF document text
    • http://kahasat.cz/data/file/zafuwitufozekatilozixapu.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/61039110598.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/lekosetupato.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/37083579835.pdfIn PDF document text
    • http://marymo.ru/uploads/files/49035560828.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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 19560 bytes
SHA-256: 172d5a40602ca741bdec8f583b217377f3cb873828b0c052a9cda777da33e741
font_01_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 10300 bytes
SHA-256: bb018219cd72ec1ff174fa91214105398fd1901fd9a79df54a5c37fb0fb34e75

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