Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea57813d27ff760a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 17:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 927294714cfdfbdf80e28e358508921e SHA-1: d3bec6075c88741afdaa475966b87ecbf46d1e42 SHA-256: ea57813d27ff760aeb6be018ee6fb37748604ccfeeb22fded96f01467b58ce6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with numerous embedded URLs leading to potentially malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbbae35c7---pudizexepuzumojilabuke.pdf In PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/mamokapizixojixafoj.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/28435940448.pdfIn PDF document text
    • http://consade.com/userfiles/file/29622913668.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/dopizutijiragebunimoxav.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/sitok.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/86540242423.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/86910442573.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/wapefababemivolusodebugoj.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/13770270901.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/filajabitanozakedorojeguj.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/xogimitigiluso.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/95316059997.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11131406223.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/juxulixixogurinuzud.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210920075401.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tuzesusopidumefegemig.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/dirasatim.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419f76268f6---dapawozakavesorages.pdfIn PDF document text
    • https://flomogroup.com/upload/files/39413967994.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5c1b5be05538e6aa1ad5a66e8c64dff3/12426043649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+otg+on+my+phonePDF 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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 10660 bytes
SHA-256: 527aa7b480e144e205f90d123d846eca47f042fdae719400569dc8f3f307d297
font_01_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 16628 bytes
SHA-256: b156751d67a193606bf665647e549062571a31e21164d2b0cc87b97f6f8a931d
font_02_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1