Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34f56ea37807700…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 929694979794b0d244dfc134f7cccf95 SHA-1: fd6af2fe699479634d2f2668978a62c8bc4e57f8 SHA-256: e34f56ea37807700491442e665324bc85273008472a2f589cfcaf51e98d7e96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which are hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics strongly suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://krisoc.ru/uplcv?utm_term=service+certificate+sample+pdf PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16119450d972d2---pemogemukumojifoxuwa.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/jumedix.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4uph2aep3gcb34nt163r1sttaa/16068749048.pdfIn PDF document text
    • https://yuss.it/file/77731171345.pdfIn PDF document text
    • https://anfauglir.com/images/file/numaxugitolo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1a4c3a8d---86523295636.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/vizekuvanilirewu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/33500864774.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609461519e162---juriperevapejegum.pdfIn PDF document text
    • http://esistore.be/userfiles/file/rusurilolejodakulum.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d0361766b---ronipufetuj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35e2798ec---29688144686.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jdv2c12r1t0fh6c38ubin5avn2/22912392840.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/pejexotasozigetiva.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vawir.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kemulakapokujarasazojebob.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf30dc715d---9709246957.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/21120879386.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108260749446842.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/29681257347.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/lejogufodaxisexezorewetox.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/lobaxaxabupesami.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f37e2118---6863213123.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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10700 bytes
SHA-256: 313bd37220ae28af07833e8bf8266a60d4104dc01d579c39207cd76b2af75928
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17128 bytes
SHA-256: 9f716a975874749321ab0443e053e11b64284d6893ba680e0503e74f538279b5

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