Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0329571d43e38c2…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 14:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b6890489b6c41b43f63df47eda42767 SHA-1: a2129624d18b4470856b97bebfd4aa5d8c218c97 SHA-256: c0329571d43e38c21ed42296d758059cf3244f9b3d5fbdd6b18801aba1532cc3
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the intent to distribute content via a link farm, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sklepjola.pl/userfiles/file/40163011474.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/41752686186.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e2fe8b0f7d3717e6a5a1b80f82d4b704/17869208127.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/wugeduzetuzukabifemoderum.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/43038312177.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/limowozonewibilo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079337f157c9---fowowujilonunusaveleki.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d092a05e64---medizediregeboxegafop.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/790241e7e214760d27c6e1059aa1a0dc/72969648798.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/33113880363.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/86884301428.pdfIn PDF document text
    • http://minerva-collection.net/files/files/jifuru.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vevaluxinujarizitepuf.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/67211619718.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d09b5ad058c1e89e8c7255fe29c4dc4f/42663340959.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7dcf853df---tonobiludi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67f8e86da---vudepidovabapugewozefus.pdfPDF link annotation
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/12319174939.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120fe7dcd6---jebew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a5d84559559e793d7fe3a497f307539a/87604639782.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/58aca154eec93c74ea75d92c6889d7fb/90800875905.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sewewawepulejobodonu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe715c027---gigotexufaviruxiwitew.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/mafuse.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210601_317A62ACD9AE6A25.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/39841694528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=authorization+letter+to+collect+cheque+book+from+bank+on+behalf+of+companyPDF 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_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 18316 bytes
SHA-256: c6c3e936c5f53ddfc59e27db04b3c09a5021f199f40fd3131e6f7fa15ebbfdff
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11212 bytes
SHA-256: d428b77b10743e9b5c67dc017fe9eede916f321cbcbbf1a3e8ca27ec65807a8d