Malicious PDF — malware analysis report

Static analysis result for SHA-256 578c5dfa9be2af1e…

MALICIOUS

PDF

74.9 KB Created: 2021-07-16 08:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b2f12cbef0f2a60a45ab2376df88641 SHA-1: 06165e9b0c698c8f28e42cc3b1cc696b8ebd8c88 SHA-256: 578c5dfa9be2af1ef4219d15610db5e912247a203e26943fef85f0d1d488c193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bcda014553878b6e782ff97795af518f/mirub.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ac5cb4447241363b8fd5484b48d2dd51/84635104711.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gepavefowuso.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b431095e---dalenipuzorarotebabiwera.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/46d723781bfbe2f8c5d4f7ad111ca607/2027557145.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/39484025591.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pujogegizexufudutupowap.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82ee4efa84d6c1ed4b370f9118f89efa/majilobefomewegewojoratu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1f677398---76326298779.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mesemovozad.pdfIn PDF document text
    • http://derma-dts.de/files/file/47528227560.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa605f9d52e---51540516386.pdfIn PDF document text
    • https://artbynela.com/uploads/file/99837052691.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3ba0e97baaf6d3650cb38ef7695e6d70/bowanedujozunuzurifafa.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2df759f47bb72337c6e8645bdd54d18e/fizuzizokinudi.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/benumemeluwijepabovepe.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2cb984ee---gotukitibubisabi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zobuwixeseb.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/zetaworijagugazudajeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+year+without+a+santa+claus+2006+dylan+minnettePDF 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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16736 bytes
SHA-256: 2684b08e235a1fa4d60cbd4de161f8dd0b9e32c621f61141000b59d5ef5f24d2
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11308 bytes
SHA-256: cbb284f388cc5338c42b9ccd07cf14612df5ce9e5aef12d72e83d90a9b8b61e9
font_02_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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