Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d65db5c549c02e9…

MALICIOUS

PDF

95.2 KB Created: 2021-06-26 07:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 924425839c1f527dfd324f49b5ac4efb SHA-1: 6690fabc25dac5bdb19686c73ed8ffc046dbf2c0 SHA-256: 6d65db5c549c02e9f058a2a4734ea7ca495832e96283386e4249fb58389cf0f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://huntic.ru/uplcv?utm_term=how+do+you+unblock+a+number
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be60f43da5b---54221863653.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4faa37cd6---nufedezafuderonaja.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/eb16c5f43884a8ae5b69a92b028d7c7f/93363247486.pdf
    • https://alate.org/admin/fckeditor/editorfile/xotarapezalogirigabijapi.pdf
    • http://clinicoral.com/img/userfiles/files/gimiruratugumomovazalot.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/enfvke52o980kashajdnoa4j92/33017064458.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/778d1a1a5e27a2aec2828baf7ffec185/wasobejar.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2417ddcb48---jokotijefodiwitudala.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tfkille3qka9o1ja4svo79j06c/65353457102.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d475ac6666---davipegabuzotijijogen.pdf
    • https://stallion-international.com/userfiles/file/dowome.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4136d72aaa54d85a8f3ada5e6f85476f/tiwevebapibolutejeb.pdf
    • http://burfel.ru/upfiles/files/32027072259.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7675c924---17797989699.pdf
    • http://www.annaleehuber.com/content_files/file/59102467069.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed776c39d---vetufokotizudide.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2238af11b7ded65b591a25fcdd2b9cc6/89838822741.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084858425131---donogabavaripumegoni.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e78bddb4---majokitexefisigokatidijum.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a89f47a95---xilaberejerevumagokojunaj.pdf
    • http://alexlunacoach.com/img/editor/file/kivugapesakar.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/381313b29f99d50b43220851945da8c0/11191962761.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fa70c2ded709e9036a085ecb450f0a38/wugefavagir.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e7be.bin
f2c051364a767a763d2091877eb88400c3ed9633e64c873b65782bcd938f0969		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7BE 16984 bytes
font_01_sfnt_off00010086.bin
5e9bfb85bc7a6edd9c523774a3e12bde17793ce80247355758317e9acd8218d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 10696 bytes
font_02_sfnt_off00011909.bin
31b1da1406b3215de7438fa5124b32d3e596788c40357184b30bf493da03f767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 19048 bytes
font_03_sfnt_off000149ec.bin
83ccc66b64451d5f840ae350369d43a0a13182671c17446cd669f3cee1af3318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149EC 2684 bytes
font_04_sfnt_off00015518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15518 16792 bytes

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