Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7c7e86490a0f68…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 03:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8271d59e9c1d1cbf255c5f08e7cbf79 SHA-1: db4cb0259c7026582c1b892ef62377f7d09b4769 SHA-256: 3d7c7e86490a0f6856b3c86f7ab6caa407713d6993914c943e57596ff58de7fe
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external resources. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179df3e1b48---55044920648.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/ledilawuwozebes.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/60416788583.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/45442124605.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/pubedobufosilubobepib.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb3b9a646---guwalufowad.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081051aba57b---45985529983.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/bokazaxusekorurorepana.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc89fe7633---96596956996.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d1dbce75---76609309640.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63bccfe90---27713359269.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/desuwitimekuxesexu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81f248c4f---45405631165.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160de324260e67---betigiwarawavil.pdfIn PDF document text
    • http://termocity.by/pics/files/bitanozigumofu.pdfIn PDF document text
    • http://myredm.ru/uploads/file/94036065152.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e69797f41627c49f9d1c34849e64a0fb/besoxije.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/84699509610.pdfIn PDF document text
    • http://lawngo.net/fckfiles/56877986654.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/juzilatowaximin.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/18515611144.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/47315870528.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/88317950453.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/subawowawiranope.pdfIn PDF document text
    • https://netpage.info/userfiles/file/30195432418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=a+second+chance+rivalsPDF 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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17960 bytes
SHA-256: 15ea73a1a3ef3d6ec27e4865af1ab94c57c3e2e0533574531ef96800f1f7fafa
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10416 bytes
SHA-256: 9c99d94243aee3ed8e73629f0e87ad57904072396a2e79b03696c2c430806c7b
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1