Malicious PDF — malware analysis report

Static analysis result for SHA-256 a739c47be43786ae…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df4815a1316d906b2219a383dd747ddf SHA-1: a35fc863273b6fffd07f53077fbb0f112d200a61 SHA-256: a739c47be43786ae1ed64892ffef31c82be41684536fd1f8a32efbd1aaa5fa69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://nomylo.ru/uplcv?utm_term=thematic+lesson+plan+example PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/59a0e2c9628c0c15974d80225e937c77/41820784407.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/79400707115.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fa990610---42534145536.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878bec1a59---11165160700.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096a43e5ccaa---bixefo.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/73707021099.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xozirawumez.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/62616570094.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/76257211769.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/64082493007.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/dofodezu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bde032e43229f21455ec9ed31226f1d1/suniwura.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc89596a0---terejobum.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106260418299997.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4e87092db65d6d16d50a17da984e7f6a/19422719715.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071661e05af0---gudofukika.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/32e2919899bfff4b3d254f2c1c68a4b3/gofar.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/21647816801.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/botuzavufapifowusin.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86e40a777---40127585210.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf30074f4---89320234720.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tnt4tkgktj963u2i8c1j22ebf0/42611844117.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6c23b0d6---98018638912.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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 17372 bytes
SHA-256: c18db332864d957a32a6029be5c13e2505cb7bb4cc86e50a9f7ec187a8f9a2e8
font_01_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 10604 bytes
SHA-256: 909fd94e22cb6de2cfbfb8fd32d0e76dfe43aba997f5aef4f0db4d527a1dc56a
font_02_sfnt_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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