Malicious PDF — malware analysis report

Static analysis result for SHA-256 2723b254edba7d16…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 13:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b6644446160c4f9fbec189b78502d19c SHA-1: 280b0b52d1f9c85071e87a396e4eeb351b815347 SHA-256: 2723b254edba7d166307e9513f73d8fe24cf862cf271f52bcc13ffd9ec10314d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=kc+and+kp+relationship PDF link annotation
    • https://atcotourismtravel.com/userfiles/file/bamekusa.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa342ef1610---dozugokujaju.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sejadosotinizimaku.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/odplhib1pjrc9hecie200h6bsl/pogexejupakejulevevob.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f42e5e23e---9545298688.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kajonujube.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/31056301792.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/21fb092ae89a54bcb1768ecccfff2088/53709055787.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/60167194480.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hvmm3rt14au3kfooh1j55foa06/sopezikojavuxisix.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7794e97d5c8af6308f92ddc898a3e7ba/58700390824.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dfod74t1dmc8rf76iso5f56rj7/26446412130.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31c6e69c9f2c5b36d5a3785f16133f40/maxelapuxidixubemukezit.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/nedubidadunimo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kubabuki.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/22201558306.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fibimebuvidujuneloxaxe.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tomamedopigajemad.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/xolanexezarilador.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9f4657aa---wexuwajeposeboluvaxelalo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/27303920233.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/somapoxod.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/426e01c1052ac97c151551ac5a32d070/tilefosiw.pdfIn PDF document text
    • 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17968 bytes
SHA-256: 52d3315dedac4d456f32e82a0727291140b609eef1fab298bf23b16e0e6123e6
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10692 bytes
SHA-256: bab26dfb498449b6e7601e2d42a14b762e6eb1e15b845624aec4b4e54e24eb0d
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1