Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39c04b13d0d4b01…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 03:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ce75a6eb42fdf884ec66d1e01b1d808 SHA-1: 9e44056322206039ea9618772d38dfdca043250c SHA-256: a39c04b13d0d4b01ddd77e6f9743673a7e4ee1894d5078b1df16cc174e41a649
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of multiple compromised or suspicious domains suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/58510015407.pdf In PDF document text
    • http://goldstecq.com/userfiles/file/53207552988.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443a27c289e---28749657986.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b05ba9afb45d5b6bab9ece8799477741/73930858258.pdfIn PDF document text
    • http://lex.tj/img/file/28975530650.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/baxubunugazabizetafeva.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b20e6dae---gusawulesarutasu.pdfIn PDF document text
    • http://4yoga.by/pics/files/48907286134.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/takofonigulukeker.pdfIn PDF document text
    • https://rjpexport.com/files/51367732687.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/5997525732.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210913171635_cgatyi.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/panodowopurezajapanubutof.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/vegiwubudizomorabafonuj.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/lenagekixi.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/67026234360.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/94824800983.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/latodemak.pdfIn PDF document text
    • http://clickvay.com/upload/files/voginesijogapexo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134cab88671b---43965562066.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/misafe.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/lewagaziledikalawal.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/68976340896.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133edd99db6e---58116382651.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/37892192328.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/legokejarobabiti.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210912104511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=onlyfans+premium+free+apkPDF 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_off0000bad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 10632 bytes
SHA-256: da8b009e31a368a4bdf71038fec090c8f7ef549cf1906ea9029777df6f421e62
font_02_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 15084 bytes
SHA-256: b5302499a7419c7dbb59fbebfc9c2ce2154bff3c0d41a5523c515397f26fc7f7

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