Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d88fc27dc5295d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 20:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5af9caea42fa7237dd1576780731f418 SHA-1: f180b51760997bfe9bc116a65b58d75cfeb1fd88 SHA-256: f8d88fc27dc5295d8ada93d41832763bd0cb313ffdebaebb4937e0cfaa02831b
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 distinct hosts, many of which are associated with compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://autosoftware.company/autoresponders_images/files/38289755700.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8f59834715639a60a720af7e79863005/lulosipadilasolazigad.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/xarabene.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/17931825471.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6c88afe1---tugolizugivotok.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aee61553---47885401944.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/95889723270.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/vodib.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438671a23a---19503076084.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0aacb336565aab49819e1ee06b4e0293/vukekikusijemeripi.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630508545/files/gesafivimupokojunulobedul.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/wemiroranilorax.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/pejix.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • https://apra.pl/files/file/tiserutigorexonaxitiwuloz.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/tawopidasobusuwuwenek.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/21ubmr92ctuvv6priud8bm7351/fagaripekulubora.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c77b662f6---borur.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/9938696126.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/tivavavokakirig.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f454238d---ridulililorot.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a46411a21b0b3616ed52dff91831ea7a/7215681709.pdfIn PDF document text
    • http://amandamaitland.com/images/file/67074973866.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9c03f9c272bcbc747603a302e529958a/pavuluzarekamibom.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/30035487882.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a8053317---xapazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mathematical+analysis+of+recursive+and+nonrecursive+algorithms+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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 11340 bytes
SHA-256: 7100be2df25ce161ac2d42a83389bedf2b8cb4fd90d40f27642eb56f16d88d02
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 15340 bytes
SHA-256: 1cdf3cdc68b18d04bf2ac5a30f9844dfc5c25cbad2df962de75009e9d36def37
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1