Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2759e9f72335aa…

MALICIOUS

PDF

93.9 KB Created: 2021-09-08 04:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c3cce9eda46ea9b3176920c94bc2cb3 SHA-1: 6957f31b64bdd87ca4fcaa6408dce037b1111a12 SHA-256: 3f2759e9f72335aafd8982670a321f2fc714269e3d641fa4c0f060987f006e96
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://migger.dk/userimages/file/53264121070.pdf In PDF document text
    • https://harom.ro/files/file/65387297592.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1b611a2c3ad10199479a67b65e59301b/buwawu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5dbd789f6d039727c48d055517058a2/vaporezavovedoxixo.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/70982149187.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/25360498931.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/80551606864.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8497644e43---9113411041.pdfIn PDF document text
    • https://aedwea.com/upload/foto/63746768272.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/75513477720.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/88771156705.pdfIn PDF document text
    • https://ridersshop.it/file/44251241621.pdfIn PDF document text
    • http://vtaky.sk/media/file/55179460097.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d0f37693f36767a790dc9f435e9bf790/43394326974.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/42915558736.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/49444631362.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/siwifobux.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/duxodarujopodu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/zilepakawagesaku.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/dezuxuwimazufo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tevidofokami.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/tomusoxujufulag.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c27d50c9e8c65094728aba1195a36ba6/xuwosuzenovazironela.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fusarobozi.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kajulexetodi.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/semumubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=choral+fantasy+beethoven+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_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 10856 bytes
SHA-256: 68917e4ae34f4125770f76a27ba9c6054d9e417dd005c2f28c8fd62c72dea7e4
font_01_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 18268 bytes
SHA-256: 6d4db1ac33c761b37fb019a75092ae8e640c5651d5350f48c6f43c7f1f0986a6
font_02_sfnt_off0001518b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1