Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3114778e3c02d15…

MALICIOUS

PDF

132.4 KB Created: 2021-08-02 08:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cae694882f5bff2a0d9fb403063b4ec1 SHA-1: 4953aee889524f4f9434f0ed04bf79cb7e2538f2 SHA-256: e3114778e3c02d15aa454ce87bb274200faec301b952c5c899d1d97bef458ab4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which are flagged as potentially compromised or disposable. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary goal appears to be redirecting users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://provia-events.de/pics/fotos/1/file/mafenu.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/novezuxedaxipotimujo.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/43940884725.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e6ll79acjiev3thgptpfk8goml/22749177880.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/bujol.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/ludenidagelawedetusoxiba.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/rogekirutazij.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/6421261091.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/44835740987.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8o1cqa42g44quh58si6iskkotm/milarij.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/98030492634.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106172146029377.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/39110621909.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bafumubigopuzo.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/74147673439.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/kemiputijajelibowur.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ad5b61ccf464032cdefdb949bbb75243/jufifirazogeredozapa.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mitasanolajavatolexa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/86066295562.pdfIn PDF document text
    • http://oodow.cn/upload/file/210617162926961685l2upuv5xb6ew.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3215dd3d9---wasekufenabiwufedibowir.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad61fb99f4358f1f9e797ea9ebb0b6ed/jirekosenapugifa.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e48a865c21c7fa8ab6f81857361f199b/pafobuvakika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=black%27s+law+dictionary+11th+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4B 17696 bytes
SHA-256: 14a0347d1f40d2ea513f4446771e4a6552a0b508b089c8bf9581855037fb7b7c
font_01_sfnt_off0001b9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C8 11148 bytes
SHA-256: 5b8e1f9a2637a0255123abe30dce51cf9029458d01da87a4e949cbe1c3375d32
font_03_sfnt_off0001ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBF6 16292 bytes
SHA-256: cd50eb7aab2f0e9a52beae6abbcea2f1f43057679cc4dd188eaef8d3d32b48e5

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