Malicious PDF — malware analysis report

Static analysis result for SHA-256 344cc440723444ea…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 20:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bfc2087943c61c2565a7162bc64fe8f SHA-1: 0f87d5500395e2c4e722f17fafa4b01a88171259 SHA-256: 344cc440723444eae663f9e41fe3c3e4cc47901ef26e229648cd2f338f1d350e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely distributed via spearphishing.

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466fd3bc8bd---1534237073.pdf In PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/tufetokipasi.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/pibixubatejewukigot.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/86820861909.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/96131129412.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/37386796159.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/88319710011.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/duvedise.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/11362864599.pdfIn PDF document text
    • http://cissi.it/userfiles/files/vezula.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a173bb3---muxepiparovekujupoveji.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/82053640093.pdfIn PDF document text
    • http://abnicum.ru/files/file/zibajovexiwojulisor.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jabokutowuwosugifiwe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4aa26951---kidawoxojebu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pagixuwan.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/39019346826.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1d5bf063---zomosetewu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/23e3856dc7f787dd9e391dcf90b520bd/62173286209.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/nenatemuj.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/40116426315.pdfIn PDF document text
    • http://annabarons.com/files/files/36229671116.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/56141555458.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/mojofalewifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bitlife+mod+apk+always+win+lotteryPDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 18772 bytes
SHA-256: dce63204b7303db7ed927d80800cdc933cbc080ca72d354822e4ca05b8a5a619
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11004 bytes
SHA-256: f7bc6ff5ea4e6040404371395381266ed2b4aa3cf194cde5de0d701b0e055032
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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