Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e39225aa104d8cd…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dabf854308ed27d877d4a57d74424721 SHA-1: 90ca264c444d2e581aeebb415d34e9abc6d3293a SHA-256: 4e39225aa104d8cdb543ba9ae8cdc530a0787f6bd52e4353e3c7baeb4f1818d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1555 Credentials from Password Stores

The file is a PDF document that exhibits characteristics of a phishing lure, specifically designed to harvest multi-factor authentication codes or session tokens. The heuristic 'SE_MFA_LURE' strongly indicates this intent. Numerous external URLs are present, many pointing to compromised CMS uploads or link farms, suggesting a distribution network for such phishing documents. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://inwebjor.ru/uplcv?utm_term=how+to+fill+form+16+for+salary+with+example+pdf PDF link annotation
    • http://pantryscan.com/123cars/imagefck/file/79360598337.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/gitilikujapepifuz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l4nu0kpgamorkdfh1og2qo475c/85494711665.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/564909e6890072a0cdcb86e7fd41b562/36900955534.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/fisireraxeg.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/99900128425.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/251844abcbcb14d4ee9e20cabc0a8047/15791717902.pdfIn PDF document text
    • https://miet.hu/kepek/vigesojamotonozax.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade216d5276---84091676297.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5f0577f---85883185516.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210608_3EC29E91A7B51825.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e742c14a39d0cae5b99a586080cc1f06/16951758556.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/k63sona3f5mts88i1midkjcg45/negamexazukute.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zewofiwosefebones.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/nimowujozolimunitapopa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefebd0fd36---76787278590.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nekomowawesojepogikefiri.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/befdd28947951281c207d9d6649f8db3/dowisusexabu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612e95b3673ea3718d6a337037ecab19/woxumijovar.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/febosufenedige.pdfIn PDF document text
    • http://djapm.com/userfiles/file/8971922113.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/jekavomumufolawilorazate.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16752 bytes
SHA-256: 24d7d6a8b10ec186bb1bfed7f29f54240a4aec000c2124aa4735c9dad245d928
font_02_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 11172 bytes
SHA-256: f9209d6588f2f2f4617884862a99ffeb32e13aa9351f664614ebfab7d73d87a4

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