Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbb42a3137cb95d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 11:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f6d4674148bcaa183f777cb3e025083 SHA-1: 497484d054ce3bc775c0336eb824a626006e8807 SHA-256: fcbb42a3137cb95d93a6c799e635e3b40f3a015523c33c73953c97d042e1bd2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to numerous potentially compromised or disposable hosting sites. This suggests an intent to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2d972fd1c---kigaxukaxurajen.pdf In PDF document text
    • https://vvpta-irvine.org/userfiles/file/42583127797.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/be17826204971431cc0ae1e40528abf8/tabuzabagizunaresir.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lukuwi.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/68831140743.pdfIn PDF document text
    • https://ottopianos.nl/files/vulibowobarokevova.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/25964366131.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/160a06a2b535c984478499fb3d578cfb/daxuvinuwovetumoru.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/17651484307.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7b5acbd729cfe76a93d45f17f23d6c9d/tatogav.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f0ef4c130dc1c5da498cd4d9416b16d9/bibipama.pdfIn PDF document text
    • http://billsky.ee/files/file/jozuxigos.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b543179f5---23760486461.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/duzisunekipum.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3d8d8bac7111c6985b729bd2ff70c492/93772487350.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110df0ed60c2---mumumivodod.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91f68e6921f5359798449699853432da/kerunimewukegig.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/pujopuzesesepepatulofobat.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/64facdd5a50dad619224c1e5d4e243b6/70892509386.pdfIn PDF document text
    • https://mangallagn.com/images/file/sevorexitok.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafedd2175---29532545546.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1afcba4fd---lamevuzuninidosefoz.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/pasokodawikixosev.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/22220549244.pdfIn PDF document text
    • http://splogservice.ru/content/files/roril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rote+learning+vs+conceptual+learning+pdfPDF 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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 11004 bytes
SHA-256: 3739f301876ed0e0b5655456971f20f66063e021f76e6d71c89d83807668567d
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 18892 bytes
SHA-256: be7367db61cb35457857e4346a65243a57127ff75c6a6fde1847c732c1e4d0b9