Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ad94edf0e655ff…

MALICIOUS

PDF

80.4 KB Created: 2021-08-01 15:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdd06b9c51261ce18cddfd52f826fe04 SHA-1: 7b7d7d8829dc072c7a6ecf6650463f298145d866 SHA-256: 19ad94edf0e655ff25e332c6fda0a0bef3dac83200e9d594134e46b7f87fad42
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alexanderjamesbackcatalogue.com/userfiles/file/womojuwumefor.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd957da8e1---35105087861.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gufaj.pdfIn PDF document text
    • https://istanajp.com/contents//files/47495704492.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e0e4d664a2c1bf53f7d0bfe5d75ec65a/rakinuji.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9j596pddv30ecjs0ov1nf2k2k7/fibovesazome.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0bbfc77ab04b1810529c00ebd3132412/xupew.pdfIn PDF document text
    • https://coluer.ir/documents/file/fatimerugetuzusawel.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f2a3b46ed6c47b02b057a041e6f2fa35/duwadokakitutigukesu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b3e371112299032de8d6d5c0ea85c62b/35774568987.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/roten.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803eb151d31---tazatoworepewivor.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b3cfc6feb77376a2476c1d37ceb9de44/dunikemo.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/jarigajegupena.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/10624789179.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105292350295935.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/89600307711.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fasotokeludomerazu.pdfIn PDF document text
    • https://autoskola-scp.com/files/selipezosotegaronerij.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16106578b2988c---wibizesum.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ac114389---13758881549.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/9401799813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=teologia+sistem%C3%A1tica+uma+perspectiva+pentecostal+j.+rodman+williams+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_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 19356 bytes
SHA-256: ddc497267cc208690489e7e1790d9770a0c9cc192b7547843f0dcf0b12773208
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11556 bytes
SHA-256: 3200cad9e264add9ad4d74ef620cc753d6da19f9cf2f8af13343f12affd94920
font_02_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1