Malicious PDF — malware analysis report

Static analysis result for SHA-256 675dc7179daa9b03…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 12:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 773068562ea172100b167e92a011361d SHA-1: 4fb0de0bcc7b61ec737ab496cc6eed08ae3c2ca7 SHA-256: 675dc7179daa9b037759e78f0419efcbb128b99e33c30f88669a046dd036b1eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://riverside-plaza.com/upload/userfile/files/xoromufidilamufob.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921018f3a1---nupuv.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f09b92a3d---89386162144.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/025f57840a18c78f2459bd367005d598/dinusemodukatosetube.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u3qbco6rh2qedg8lip6rffm5k0/wetumudowumexisemarawuvil.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/52271305146.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/38612820392.pdfIn PDF document text
    • http://4rrecycle.com/files/file/bexuzuzipedixeges.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ot8q1gge62ct2ltbm39583luq5/maneg.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/rokosegelavexedinuzodiz.pdfIn PDF document text
    • https://tsegypt.com/file/fuponefa.pdfIn PDF document text
    • http://effektfilm.de/files/file/rafegezagoranat.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202177115726053.pdfIn PDF document text
    • https://codecs.ro/images/file/34675713993.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5007eed64---43587099133.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zitufoxebijogomijuda.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/34323301684.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e27a2b8340---kepolavudumezolukar.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/85e14034s6l46tpkn0u40js73k/34089125442.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/65477855093.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a97cc488---13467114510.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160717f736d7cb---85952430116.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/32601573584.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/28613040254.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9c0e9a2---86020467488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=first+love+%28short+story%29+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 18216 bytes
SHA-256: 87d17376d1bdd9e5cce7cf899f70fbc262b1c4c8b30f7fb7f2529edbea92d555
font_01_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 10644 bytes
SHA-256: b9a8c0b978ba8baf3bdeb051fe2ba790d95fa6e098dd66e0f8557feba8157e0f
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1