Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b319590ae15fa4…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 10:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad0b4cc1b244dccdd6a0fd520260588b SHA-1: d6911bc2269c12fa1fbf76d47de8d4611e62185f SHA-256: 53b319590ae15fa4bbdc09fc595bff5c5f23d5e714d4e8421df9a3eb4da640a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://jagatjyotischool.org/jagatjyotischool/userfiles/file/desikenevugaxukojedesik.pdf In PDF document text
    • http://lukinserv.hu/file/lubipebodujizuxulasekisi.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/detitidux.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a7c00f408---wafire.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/moweliporobutufamufupit.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/93919031373.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zodasojezamunow.pdfIn PDF document text
    • http://quaint-house.com/56970143599.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608048a334893---81749163049.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6ihlfki7s2q4r67446fe8dmfoh/dofamagevobej.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22893926989.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc35cadc2f---vivavowamavimomepe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e433bd24---8375196645.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wibus.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a4302b4541cb8a8a936e6d98cf1a18fb/85480125316.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/03409db4469fee66b4b847a69021aa0c/vurovanejagogizumevimif.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/60593353864.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/ditik.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gavixejidegevifezojusigus.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/fexilipepopezofi.pdfIn PDF document text
    • https://kueapem.com/contents//files/jozumelufupija.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nukedudej.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vagivunetenodox.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8ad38222f5e0fc4546b72fff0dff8f5f/46346983843.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d276886d5fc---damuwogilaluf.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210809135929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2014+range+rover+sport+supercharged+owners+manualPDF link annotation
    • 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_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 17608 bytes
SHA-256: 09dec9d02437f1fa152a5fdee15258986e61a07b58920dd978fa51577c3136e7
font_02_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 11396 bytes
SHA-256: 832425fb4531da339799d11451b81a18f7d5b2dca9a1427946fa4b9ee3ac693d

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