Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5876551d57e924…

MALICIOUS

PDF

87.4 KB Created: 2021-07-31 05:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7da2d5b6cffd05f68d64dea2ee55e18c SHA-1: ca267a2e14d981d4b0a2072533b92e8e121e84f5 SHA-256: 4a5876551d57e9244ff6d1ae43b3a8ef8a77a09cfd27365d0ad623399ded37d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials by impersonating a service requiring multi-factor authentication or a one-time code. The numerous embedded URLs point to various compromised websites and disposable hosting, likely serving as landing pages or download locations for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://elskenecologie.nl/files/58728135765.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abae3416a4e---fuxif.pdfIn PDF document text
    • https://ever-progress.com/upload/files/timakabowaxawexupo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnpt9nedeujosdgbp6opubjcfe/bizidepetatodokarir.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4504a93fd15f02dab910d59da6029e3b/43370462130.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d6fdb891---bawunudiwina.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69591907825.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00e6b693d---vawijukipozorovi.pdfIn PDF document text
    • https://birotex.rs/images/files/55097992814.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/babanozoxotalitebozepe.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/defd179b491c8c22ed223412b734b453/foxivimaruzaxiwefin.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607088dd913fb---38468913470.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8vrkqfb96e8e1qkor9joj5ukv6/jetikox.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0062b854b4e8d88201d7cefaad0bf518/koganajuxalulumonibo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/84431903318.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/ripixekagurijazibu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e44a6d34c5---finafopagunufi.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/fexizunewenefamo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/75787865177.pdfIn PDF document text
    • http://iwishop.hu/file/pikis.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8253b37d85ad54dda73f41602733c174/ranedinoxumupogidorabogom.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/cd843036b231227fdf95790f5176a3a4/8027704265.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r2dp0jklvopv4dceup79167mt0/15845043577.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c526e4110d7---73862151142.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/sekaseviwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+text+a+number+blockedPDF 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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10852 bytes
SHA-256: 31e7d22c7a0d8234c72bf8a4c77d9115360494350dd7a78526b1effede4d3d97
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 17028 bytes
SHA-256: 400be4e244953319e61cfebb408c417d4f3ff4d56962d1ceb5fc23e35a59ec93
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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