Malicious PDF — malware analysis report

Static analysis result for SHA-256 8651207d2877c571…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 08:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e9e66eec9e3eb1d36e432b1a74ab9f9 SHA-1: f1a818079b3d9dc4bcfce33d1d49643516776701 SHA-256: 8651207d2877c571a80b80bce49c48d481f568cb0380d93ccdabaf2b7bf7df41
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3731d946a3---22785856546.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/45360366200.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4f42326b---60653667875.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gegalasij.pdfIn PDF document text
    • http://midel.me/userfiles/file/jopedisuvuwazi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5740d048a42f949efb0d7b391d371d59/xowibew.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624217002.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161025bd3b2a85---44585345158.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9dd044b85---9561375500.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/firuruf.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/23868595151.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210607123721.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/mowakikived.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c37ecdf136f74a5bf27666e6f95c39e9/45356792652.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/7261611304.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bejisupoke.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d4330e3a85cbbd680ee0b9135456757e/mujuwetikexen.pdfIn PDF document text
    • https://alutat.com/data/file/tarupepogunalabupebaw.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae288bb947b---lorebefakadesesupawibivef.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/20400393622.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79c314c96d65f3a9f2f4e67cd10c3078/zulodotenezaxatogu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dosovi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/74862937862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=american+staffordshire+terrier+earsPDF 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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 10676 bytes
SHA-256: b74ca8ddc4d16e03d79a456d23c0248b21e6007dee7e6831bb6f92764bee4ede
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16912 bytes
SHA-256: bfa575fd7a7fca1f6c23772d6c4b4a3bc778a2778190df7ef6d1a99c6bae77f8
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1