Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2a5320887ef8c1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 14:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e79216503c6b8b1a55f45558f04f3b61 SHA-1: d9c1d12781c2f31b6fd863e93dc53e6db8c715da SHA-256: bb2a5320887ef8c1cda29d598a330a3d4bba6f5803490c437a1e82a3847a8112
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://divapharma.com/uploaded/file/34068237299.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429192924123997.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/veregupumo.pdfIn PDF document text
    • http://esen.life/userfiles/file/duvadumoriv.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51972151038.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21485b7122---kitufotawofibuzadareviben.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/33f039fc0c144fd6c28d771020da3f8a/69427112407.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161261c3440c9f---zusevoke.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/volof.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c8db3417b9a731d61528381a32ca4040/befapuduvupuxubitix.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sulogosepu.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/84883925280.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080609c1ff90---roxitutozazozadam.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/68637335150.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xigizoxamobejifodotoraf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d799ff5a17bbc77b47dd8dc3c63235a/jegenutumepe.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/45910641444.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/ximop.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/36d08646e819b65a2dcff35ece928f1b/zugowa.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/22864485156.pdfIn PDF document text
    • http://cudicio.it/images/file/mirofaxipizewunetugere.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/7464212560.pdfIn PDF document text
    • http://change4best.ru/upload/file/sitamedinitodebu.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/91788063968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sales+promotion+project+report+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_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 17588 bytes
SHA-256: 9b536347529330a429fa63476b080fa5e39c59f935f4077aa4da7edd42a51709
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10988 bytes
SHA-256: 2348fff3ca7c9ee2ae913e283d7dc6da2aa2923bb1af1d8f3f0e428cf6be7cbf
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1