Malicious PDF — malware analysis report

Static analysis result for SHA-256 503a291a1e2844ba…

MALICIOUS

PDF

83.8 KB Created: 2021-08-29 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ebed290463257ecfe1046cdf7ccf7cf SHA-1: 2224d425451787418a3a1a18e07ebd47796055ca SHA-256: 503a291a1e2844ba36f133761f7ac20ee014153275ef40abebc95e93f3a437dd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3266c1f18e---8175888200.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/f6cq0vmaie4hmagbrjqhjt9kkp/wawojerelimusox.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a830f8c1---57113695081.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/601rsac4sfkkr5v36jho3qusf3/63719116165.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e8a981fad60ba354a63d6974c964cf7a/22661064399.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dgtpeuhjc8g1a5cj987ilrt8g0/37350475757.pdfIn PDF document text
    • http://polipack.ru/content/file/vexumagoguginuvubasak.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fd4b888a---refumenud.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/54024338821.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bo0171g03op0es1rr8472jdim7/61747878369.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54de141f8---lijej.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/18851449694.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/perubidutebub.pdfIn PDF document text
    • http://ndt-ultratech.com/files/tekikesul.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/povonomuzobusotij.pdfIn PDF document text
    • https://questyme.com/userfiles/file/kaduxamunoxev.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/wizemebupijivodofafu.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210708_000641.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/romowolelufolipikexis.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hr9o9njr7pk2gapkqtb2qglam1/64619749205.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b354fe67707---volufono.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061809011373499.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/senifejewereri.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/rusedikemeselate.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d68adc7db036b0293bd15243b0e1f9f8/tinipowaxekidawurizizem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mvc+latest+interview+questionsPDF 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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16604 bytes
SHA-256: 14607198cd0fc08aa80c354b2eb5a25254cd98fbac45b17712dc2ab401e6692f
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 10612 bytes
SHA-256: 0ae7a586672dc9c65387d6fac261464eb4540b66fa2f71f8119e2efa8172c32a

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