Malicious PDF — malware analysis report

Static analysis result for SHA-256 695d2c9a1877b81c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 22:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34eaec8b77e73ccf858cb5b866d91069 SHA-1: fdb02b5601b6c3dee7228916a435857de36566fb SHA-256: 695d2c9a1877b81c97473347cd258156be481d8002ff840159aaa861e1462dba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The presence of these links suggests an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc874ee9de---72239216840.pdf In PDF document text
    • http://www.reeder.ee/files/filemanager/61735737542.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/jozurulaxo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/gififosevifuduwis.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/54627397372.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/64948596457.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/41811829650.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137523905436---gimesexifufunom.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/21892282421.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xasijenipa.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/furevizanodenaserozox.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/71619546349.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/23669516682.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/80505259430.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/38166617464.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wedapuxivitikefolesevil.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/76032980526.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2961ecc6755d84d0fa9132878798e1f7/85854528654.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vukerofigobinijesose.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030648251899.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///34686756400.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/daxose.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/jopiribijisevu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xavirokotudifudibelarefar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=earn+to+die+hackedPDF 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10328 bytes
SHA-256: c9076961b32ba86a9146d4e657eedbaba930d47169a484d658c2a1e8fc51ece5
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 18712 bytes
SHA-256: 1992c6943ed01b15f10b4074a0bbd9795d63816064d223b408a4498b73c8007e
font_02_sfnt_off000131b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1