Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3d966a3da8eab0…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e59532d0fdb6fdcbec457bce68c334a0 SHA-1: 0562ab4a6a039d4a5e7a2b8828c982d0714c2aab SHA-256: 1c3d966a3da8eab0c2a3c6d1b87ede0d069a64884069a186666bea9ce3b43565
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDFs. This structure suggests a phishing or malware distribution campaign where users are lured to click on links that lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l8bfrj4njo07qn0h49aiquei1q/52947079978.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2790fe9270---46371959697.pdfIn PDF document text
    • http://www.buildonhope.org/file/ridobibiwuromogekanumo.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/munojajug.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a006637b33e---vikesatim.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a06f091ab12bf80f893b5a8bd3cec264/torokadaxozepuxurana.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b38e71205.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb4hrvba02kthsbg7vo1fv3ohe/70807317751.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9909fe51---setewulasunujuwivika.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8d2708ba---gilinon.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/43453726398.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a63505437dd---fejarewubijenaki.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/11181887860.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/908fbca3d7d21bc29c677f084b817306/wapuximefawabaviwizagu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/66653900751.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/bubuwixaw.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/mamitubowigaludubi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d4f2cf78042b484c6dfe1e438588ff13/42433031822.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/16a5a626d3559a0929df55c8f973420c/26339139556.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o2ahu7lcf4cg9u3of1cpi7ep00/39330955831.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c861c6f7bf---74403219267.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/90825042012.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9a68dae3---sofalawikuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lithuanian+strongest+manPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 10564 bytes
SHA-256: 7ce9f21f422c47a204cd3e314a76a72d9eb623fc7a38ea624cbd8c3d18744fcf
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 19016 bytes
SHA-256: 520c45757891a376aa181051d077a84d6c61929234991623be278bd9b49c3692
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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