Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2eea1cf51b57ff…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 03:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56a6785d0b0cecad4cb16542c348420d SHA-1: 9244e2dde8a97d3a37e8c43409432d7524dea306 SHA-256: be2eea1cf51b57ff0a0391a95242eee0fe9b5652e3407efbc5ad56494ec72d8c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on domains that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple links to external PDFs suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://electriccityusa.com/images/fck_uploads/file/nebizesejo.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/43525133683.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/kodinakojutaxixobivixoxe.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/remerajesizoxexuw.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfbc4826f---36514017190.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/lelen.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905132152_pkkzs8.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/kijenojeki.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3aaa63e1d66cc7b61f4630f77f875c22/lokesavakor.pdfIn PDF document text
    • https://eventaipei.com/upload/files/38779896734.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/89089870562.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42586606633.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374929b199f---57835833745.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/bd9f254s4iuhnaf7d6u31v5ako/pepuruwixe.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/marakikigavefemumuvar.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/52006636374.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/2972151270.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/21742487766.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/fibokofetimenowatalofat.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319f71dfb76---zadopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gullak+season+2+watch+onlinePDF 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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 17200 bytes
SHA-256: 753867b1c573bd9291c6f6d0ebade3d1e290939b0f8b51af26add7e8ca246430
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10664 bytes
SHA-256: 1e27c74bdb1202b922ded9c6ba93974d5f875e3211f62bace466d21dde263568
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1