Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efa0c5f16cf7ec9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 02:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b39e73b8250eaf4b850162f0ad32c96 SHA-1: 7572e48810b3ecac8f756553944c8e707f113d92 SHA-256: 8efa0c5f16cf7ec91b8273eaed8b2e6810199bb38dbd164f626ab7dfc7ca86e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://naturallabs.fr/userfiles/file/97397965058.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/wajogud.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6ej7v56jc0vb2qi3p9n03pcq2/xizuka.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e6899f23200937db9d05d6c7a19763a3/75604256532.pdfIn PDF document text
    • https://istanajp2.com/contents//files/sawojukajizudilota.pdfIn PDF document text
    • https://fong-cai.com/upload/files/2674623735.pdfIn PDF document text
    • https://soechi.id/userfiles/file/66728068551.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1846296db65021abf86be471133fc86/rovotiroxaf.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/julakugexatasozevudijeji.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/jujamupetefudebomen.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b30696fd7---71503806502.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/64575993541.pdfIn PDF document text
    • https://avenue102.com/uploads/file/netovagigiluk.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc5d7fa3d---55067791176.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l8nq7t7edabel89kmvbob5drg7/judofixuwatiwezikiwuz.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/69964774552.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/46558687696.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/penamefakajopapubinogilij.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/14f1a04632f9e4295d9c9c3b05ae2a17/65652289208.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/dexudakisunejewiferof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e9b00bad---3624642679.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99ec0f283---lajodowubupifima.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/a0fbf14ab2d0bf81fc520436adc09780/14230034278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=low+in+conscientiousnessPDF 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 17452 bytes
SHA-256: c8e42c6eee73246bf7b42003ae1142f8a8fc56078d63b66ba86922b80d01ab95
font_02_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 10060 bytes
SHA-256: ceaaaa75ee09464249075c8c50163328c2438e4b3fd45b92f191de546f6ff0cf

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