Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b3080fb49fa191…

MALICIOUS

PDF

75.7 KB Created: 2021-07-06 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28cf2896119a2b8301d00fb3006ac997 SHA-1: acc5b0f599d0b043fbe9299ed4f7c37962fe6c04 SHA-256: d7b3080fb49fa191763dd10a27afad1961dbe61ac993a43b855bb98ef3a69c77
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://instant-image.net/UserFiles/Site/File/93102304166.pdf In PDF document text
    • https://people11people.com/uploads/File/welos.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/32107561201.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/81691237164.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ng8mhguqvlbbpu09d3d3jint30/59016230459.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/31023212442.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/zogomovi.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021063017155573499.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0c045c2322079e00a3baa28dced5ba6/xuxipifir.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/423e1db8723049181c2d668f7caea78b/79741553078.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a3a0b79d---rutewaz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9ea5ae40---kipovevudawojajonizorer.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4tu3gt6qlckcjm1gs230t793fl/renabego.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/sakema.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/wefutulojewuzena.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d93f71d03ac56a9064b64c3f4e80daa8/vebeburamabotoduw.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixasuwuzuxa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dbh7tungckd2l3hljal8rsua12/51438154765.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7172cc369---28137976423.pdfIn PDF document text
    • http://fructusartis.com/i/File/79243079125.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4344839d802561cf09718275dcb22b7/20403749095.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/57459993311.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ac5bdc15---lusolitowubutawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fentanyl+and+methadonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 16348 bytes
SHA-256: 40f35993d20cda6d92ffe228c3a9688b5878bf7ec50704e1578ab7d0cf1ac5d9
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 10244 bytes
SHA-256: 5d76e1888cd01bc3a52cff72f9259c3dd2bce93014553b9b26f3c9e975321e61

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