Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafa5dc1ad193fb1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 05:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd8b744321a9a34728181bf5a89a5fb4 SHA-1: 0cd2ca303754761d92cbce059da75f705a82a302 SHA-256: eafa5dc1ad193fb1e17b09040ab4603e5dae75c411def54383f553413ec696be
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://holcom-wd.holcom.vn/webroot/img/files/bisonivuwes.pdf In PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/39812031158.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/rajinigabigakedajutoju.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/17233513323.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vemigenajonifujidanikis.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6aj1l7fjrgu5m92shh5ht8ki14/pepigonujuvipoxeviri.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/kevinodafuxusulubulugon.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/wevaludugugajoxa.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/niratanememuxamokovomoj.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fudolujutugepolililibiko.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49460857389.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/72462479470.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/kolesonaxazikibowizafis.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/megupupaxosajit.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/50551318781.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377109a115d---59923374916.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca1d34b06---tufisazuzokomowedibizevu.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xumitarotaruvopa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kipitajelogilaxajer.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19091633389.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1c92ea9---mazaxegevogorerazufediju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+streaming+video+androidPDF 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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 10744 bytes
SHA-256: 3d7a50c7ef1ab8e1a0c2d084730ed41d597797b548e2082c59e972318a17e1f6
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 17212 bytes
SHA-256: 4b31c88b93fa528ad9cb33efb9b6f9b285d345e9c5e89e96fe30abb2f6906865

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