Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f87bf6f23f12bb2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 15:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4372c0c5d9b9a4b03bd464860263bd7 SHA-1: acdc51e4ce588e577bea0ba22dc27dc2f3842df0 SHA-256: 2f87bf6f23f12bb2f9e287e99392afd942fb010aa7ba4be938a26b4dc3387a1d
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 also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/59193e5f55ca00050351f8986f99ed84/74230093336.pdf
    • https://tecnibat.net/uploads/archivos/jimovijuwamujosiwogov.pdf
    • http://anatolianlgs.com/userfiles/file/wexebad.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a45ae4b9---45167329338.pdf
    • http://nhac.ditimchanly.org/Images_upload/files/luwurobakumidilaligipe.pdf
    • http://tfh-filter.hu/_user/file/xezojexixevo.pdf
    • http://ithaca1961.com/clients/875375/File/63219284332.pdf
    • http://bajcsidavidfoto.com/_user/file/pemipiripevuxala.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4c9lo17bseomto0236hfb56tl7/wadoxejowumuparubejozuzok.pdf
    • http://dblbtech.com/userfiles/file/9869645640.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a73a88c0d0883435438816f068813edb/5387717613.pdf
    • http://moreit.ch/productinfo/file/12058992775.pdf
    • http://rszm88.com/upfolder/e/files/20210815220840.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6119a8c9f3---56428989265.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/a69ca40a9731dd9b817a881ff93e2154/putudaxiduvavulabes.pdf
    • http://chromatographvials.com/d/files/46117114165.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf095bd5a---rejukupomopafuruxiki.pdf
    • https://bostaninsaat.com/image/files/getokerunagivamakasavon.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/439d145b533cc1f256641336479f91e6/kevenabatodefiko.pdf
    • http://kulturazebrak.cz/userfiles/44285198839.pdf
    • http://jinistudy.com/_UploadFile/Images/file/12184046734.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c614e2fa1a7b170cd9912e5e7df3d749/lipijolazurebirutoleseb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adjektivdeklination+%C3%BCbungen+c1+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c5.bin
d466059c88a8341384d9212dc802d99fe799218c988cfd8725fcf5347a45392f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C5 18652 bytes
font_01_sfnt_off0000e89b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16792 bytes
font_02_sfnt_off000100b2.bin
b674443046e19dc42b321241f71e08ebd2a2c36b75c291640eddb7cbf1372dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 11280 bytes