Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b0b4e0cae055de…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 16:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44e520c90332b944de37d922ab9cac75 SHA-1: bee0623d6c1930522094b671481c38d1fcf08b89 SHA-256: 92b0b4e0cae055dee0c806fd1b470c7571bc997b2c2704466d2f79cfb2627fd5
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Credentials from Password Stores

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of credential phishing and payment redirection lures. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting an attempt to harvest user credentials or financial information. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://crysiq.ru/uplcv?utm_term=how+to+transfer+hay+day+farm+from+android+to+ios PDF link annotation
    • http://rilta.net/userfiles/files/90053739932.pdfIn PDF document text
    • https://umutfm.com/resimler/files/pomabezisibidijoku.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/96109915516.pdfIn PDF document text
    • http://119pump.net/d/files/vixukeranezoxodop.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/26005869950.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nomisir.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/xetuzobefotiloxamosuv.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/34951221346.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/86745505082.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/36644760826.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130edfe11a16---86252008113.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c857f5e965687e2101d07d3a418dbfcd/zizobinedo.pdfIn PDF document text
    • http://keyday.ru/files/files/ribojakerek.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/nudapuwobotipowuxu.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/zuvoripotinesedapebu.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/xizurelomukapolakar.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/saxedavunefov.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zufomi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/rixemete.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97035094803.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/29832452442.pdfIn PDF document text
    • https://shevian.com/images/file/81192291471.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sumirujiva.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/11934317713.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc697b6d0d---25773989627.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 18700 bytes
SHA-256: d41f3f6f67b187d10736b93c8e032a2c6c184b1537c7f7b58892fac40183662e
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10764 bytes
SHA-256: ec8ca0ca85544d268c11d15416f20ab816a682cf3b917399c46820affb8723c6
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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