Malicious PDF — malware analysis report

Static analysis result for SHA-256 c445c84a078c9cec…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 02:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 004b9ab5cd271e3e2c22cd1684f3c629 SHA-1: 74429c45cb95d22b161bd6f1a6143242783c857e SHA-256: c445c84a078c9cecd996de2ec169cac650003c8b16499af779daa51cf5b73563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final destination and potentially distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mhinflatable.com/upload/file/64555999174.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/asj937gv613gnmpi0cn1t679un/kekiminijokinal.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c004ec97---ruzozapitinoteseguderufuf.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/sotegifaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a017aa4173c---roxuvasupapag.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/97152712022.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/11835768194.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1e6137f8654b9223ca776365962de501/dofubewudelututabafejafig.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6850980b8---66459528429.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/46e4np9jhnlftuerpb9gcfn8vh/wetunajofozaluluwepodila.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/67353363537.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/91721617106.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/kesikonegurizulewepaba.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/94188470981.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8947b69c8---zadekudiluzinemivuzo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/12345399589.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/4156852157.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0630/7bcfa365971746aafd85e347e6e4cb54.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/86380141539.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9b37d02780087e44f514cb72c539ef6a/63900887253.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/sidaderoboxapekipugi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/51949995884.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cb75f1769---46495887461.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bomenow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=funny+clan+tags+on+codPDF 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 17492 bytes
SHA-256: da4c9239b6c30522a70eaae8192af07205d4a13df30d26a29d4762511e6c5e41
font_02_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 10412 bytes
SHA-256: 81c2673590c11819980e7c41c90e829a2ad2c37714bc3b7597968fe36ed70d68

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