Malicious PDF — malware analysis report

Static analysis result for SHA-256 8959772cea7e3240…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 02:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4f3286c73a80b33b04859a38139ad94 SHA-1: 360345e155ddcb92b126214e6e8d49e4b8f204cf SHA-256: 8959772cea7e32406c0595e6741acd1416850daabdfc364cbadeb9fc0d245258
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://enricobarraco.com/files/xifuweko.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e934345d1---xebisobeduxokojenelo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6c7ce7f4---37897060266.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/96103910667.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/kevitalitegilupu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xazevedo.pdfIn PDF document text
    • http://epicridesnepal.com/files/2069879582.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/99043521460.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dusitezuxokani.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/beporerejabodubigig.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/26629706809.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/donaxemituporabetajabinet.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/kuradunesolevetakoxed.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/96449047285.pdfIn PDF document text
    • http://temple.mo/userfiles/file/52570310367.pdfIn PDF document text
    • http://actinq.nl/upload/file/34258751118.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/rofikofanavibirafe.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zekozebak.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/sopotovuzonovedesebeja.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109022035292783.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109081523042189.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109140611372045.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/jubumokelarabumuwenebuva.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e7765584045fc195646c23ce5d172605/50491372023.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/38798771270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=every+witch+way+season+4+123moviesPDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 14908 bytes
SHA-256: 36f72e1a381aefeddf69849879b173248e9f33bedcfe4d5ffcb14cf5ee12d92d
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 11120 bytes
SHA-256: 743d0ee0cb58e9770069330e6608dcb10ea52917ff99ddc23c4669f7229cb03e

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