Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b31402b1c92afc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 08:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac651b44551629fc3576d9f5579233bd SHA-1: 0834f96cda7ad20db044b5755c82f758899497f8 SHA-256: 28b31402b1c92afc3ad822a4dd289d4a43c34409a0486fa6519dd567e4213e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=soyal+access+control+manual+pdf PDF link annotation
    • https://morganmethod.com/ci/userfiles/files/51406153380.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/gukoziluforutivuvis.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/75047939730.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vodofopijuxozetozowokilef.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070782314454---xawimezatapuxed.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ae28a8917---nanofefomizuxa.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4gqpomi93a83pcd829nujl21u6/virebekosizuvut.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xalukudowikepod.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/punufotuwujalosel.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/zanozitupibadudejovir.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/83733211363.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a93e87f5e---lelal.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/17976963695.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160893947d56ec---powipufefan.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/lobitapisilidizox.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/63628276416.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/irk3dgbp7etsg09tcql7o2rtg9/81300525573.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/92950811613.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/36163763587.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112774abd9---pigaxajad.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a092d19a01d---bunafixebamabagelevavod.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/vakuluwerodur.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5382ca3fce968dbf263f69b5dc49521d/zapopi.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_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 20312 bytes
SHA-256: 3a4bd4d27dd2801cd21e5590d756d1a3a8109d5fdc114958d5846d8270fbff9d
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 10980 bytes
SHA-256: 6fe08f76eca6cd78d99d5390dd32a1eac33e729a4f272055481148f0e4510394
font_02_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1