Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fa6e90d420b189…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 06:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c35b737ab01e5fcb7317a42a1fd496 SHA-1: 2e51c08cdffcf6d1417503f4102aea484e7aa077 SHA-256: 11fa6e90d420b1892308c99c9e6fa856bc28c1a0f5f862209d7330d66746a04a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2jorboudofdubm54mhfm38ok2t/81244448724.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b131e966c59a09a39853a5599e8f94ef/walutawazufidadune.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0aca3a157d21e4a4cc58d46f191eb314/31317047052.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd69c33f---92115079966.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/10763442989.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/bulepod.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076caac86542---sajovedevokusud.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97d50abd4---60433885544.pdf
    • http://jfkanacon.org/data/userfiles/files/4779996485.pdf
    • http://hotelclinton.it/userfiles/files/71507647790.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e39f8ad15---97546843992.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/22nbpnu893lo3i9ad9355cvae2/4263291056.pdf
    • http://ajarnveerapong.com/UserFiles/file/87391090318.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/156f06b09c69eef132e7aa40a08585b5/jezedoderorasew.pdf
    • https://bayramkaracabeton.com/images/Media/files/rerosorosalegafawivin.pdf
    • http://crm333.com/documentos/file/loxinebinefowerufisawulu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1245a97c3a092e4a9fb9c9d19c0a881b/13038223499.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xawebomidosiduf.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/dapuliwakodozudo.pdf
    • http://westernstudioservice.com/admin/userfiles/file/dovevijav.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6b6af215---89115126265.pdf
    • https://chupwo.com/editor_upload/file/wifasobevarizilewivevas.pdf
    • http://alexhofford.com/temp/files/file/vebiwarubop.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160831d591a080---60470601901.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ratio+and+proportion+class+10+icse+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 16792 bytes
font_01_sfnt_off0000ff71.bin
36a2119a15c553bc6319b92dcfaa81aefcb9bd5b2cb43c448b04e2731d2df0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16752 bytes
font_02_sfnt_off00012b29.bin
1cc6ce6e37732d7f764dfa028adf4031767f0ae23228fc1a10e0beab041a097f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 10832 bytes