Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49f28eae9138ea7…

MALICIOUS

PDF

79.4 KB Created: 2021-06-27 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39596f959e73cb448e660302923b3ead SHA-1: 27c5404939e9f2880f2856628e3b3ee201d9b9aa SHA-256: a49f28eae9138ea77345b0973026b73981c52b423ede7cda23660d6d4ed1f723
164 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a5b52eb7---disizenojasejirenev.pdf
    • http://www.aadhar-interior.com/userfiles/file/73384038972.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4beef10345e39022298402f152f28f29/bisugirubamurikibiwexo.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3614b2d7e---31100328530.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bd2bfbb2ddc90aeb95218045051cc2ba/75208690382.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/wuvivugoruv.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/941hhtphoje3hqqs1d3o9uu8e8/jimewilaramotozeguvez.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce829d336---wasanunu.pdf
    • http://nomaquito-travel.com/editor-images/51236546307.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609457e40eedc---19441654232.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d1d43e79---91855068166.pdf
    • http://www.kammerpop.de/files/file/75967054877.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r66jop8plj90jfg0hck3eme7s5/7199890353.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b802efcb9b5---maxujeduvelotigolowa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3032baca---sexumenetexegorajinow.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58uvd0gfrh6e2fb7kjvt426icp/javegi.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c14c7e362---rudikinesolumakeriripu.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fe99b1fe148d6e01934761958f16917f/57337779404.pdf
    • http://pratiklinik.com/img/userfiles/files/levesojukufir.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856e619ff05---favemonetalokade.pdf
    • https://majorsagilekvaros.hu/uploads/file/xoveji.pdf
    • http://yaqeen-eg.com/userfiles/file/limiranedasikujew.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/794cbcf07b2349581f785b4af6641526/wobatinixakowuzisevo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e5b2268---75627882699.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/17120081014.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sale+of+goods+act+1930+bare+act+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_off0000d16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
font_01_sfnt_off0000e983.bin
1f274cd7983801fd4aea62fcc53ef0229caed9a0c96cd3c0a92abf5e44767312
pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 11328 bytes
font_02_sfnt_off000103e8.bin
abbb44f3ea7c0ae6fff4746a2e8e8218ba500e108758a36ecc0e66486f128837
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 16492 bytes