Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2a8bf5cdd9b1d8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 17:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0964b29c9dfc0768eadd2cd68bcb78f7 SHA-1: 82179b7531627544d1050e9017f608c497b0c7ba SHA-256: be2a8bf5cdd9b1d84c3e7731deee048f902002f48e6c016288f0ca1becdee45d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URLs suggest a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6dd2cdc6---95166560456.pdf In PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/bibuwi.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/60160705471.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904023050919586.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/59941976600.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/vipotefoli.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/2952843246.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38928847515.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/dobaberepezubabe.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/jefaroloxadugu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7657d4a272468d5c59b4c941d58b7aff/8425063092.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/ritulivotajosofo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20c890e75240cfc306a25adf2f9a9d4/ronuxi.pdfIn PDF document text
    • https://intersat.lv/files/file/19062145896.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/bubezesanupetiwaleluw.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/39985581881.pdfIn PDF document text
    • http://getem.pl/files/file/93876467331.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/76455460830.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/jonexakofanemomozudulodu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/86751728630.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/75507577060.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22813403286.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/34164531693.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/taxopudimofotugelatodira.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/53605206687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=read+harry+potter+and+the+prisoner+of+azkaban+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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 17584 bytes
SHA-256: 39a720791f235ab06ac515c5bfb6fa41cc014cbf9dff3bdde43a8fcf4116e902
font_01_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 11000 bytes
SHA-256: fda6fd610f7828874752ba6a5be37593d83af221fed05a2f8716f38695172653
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1