Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690dc31f2de8fd5…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2b1abc687d6b7bb3ca5a587fea5afef7 SHA-1: 8cc39cd34600866cb4b7f86fa89d5be7b1f291f2 SHA-256: f690dc31f2de8fd5b1e33b39018e296211f7e212653ee7da0672dbaaa201d08f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://e-photo.lv/ckfinder/userfiles/files/kedenep.pdf In PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ptbgjoc07b2n271fu7pn0fc1u7/9578969880.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2f7e0d822688c0367cefa607fbbbf482/jedoxasirogizetuza.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/didulufodiwiped.pdfIn PDF document text
    • https://seikico.net/img-tym/files/93173569884.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/58786249327.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608c84a584f0a---92969560920.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430df9765a---86684809872.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077199d25031---poxunarovavok.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa840da3b26497ae38abb208a3f524c9/vogifawakakojuxu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67540831a2---80553198564.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160babc93877b6---58363079503.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/44bfa792c7b78f4b0ec1fa1c86c943f1/viledofu.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d329208013---80230612890.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab88e0483---zawidesojuvojegik.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d09ccb111329f2eece23d03d41bcf5b/kameladewawiwid.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/kevubovinosazi.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/livoxufonegu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/31432549921.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ddf4cf81ef50e4ff4a18c49685e44f60/66406001480.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/57ee9b7e4682cd6fc0eff4627e56cfc0/mumagojovek.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o59k5omifse86c2rjfmj6vut46/87005446849.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/23372235600.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5907e4c41285feb2392711aee469cc6f/49833682510.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211dbb3b53---tejirowaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5eb38b9aa16ecb3941d7e643dc0a4f8/doleluwonawilonisifaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=specific+gravity+of+seawaterPDF 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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16912 bytes
SHA-256: 9b840c94d6c5bef7003f3de2ed6d711d268edf2a2e4947694af04f51d31608d3
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 10844 bytes
SHA-256: 95fc05163d5abf862e258fac97d94ee5a998ee1d721f4271f70ace18e695dbbe
font_02_sfnt_off0001362e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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