Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd80eecdcdc1f19d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86c868761a6a31f3b607229b3587f3e1 SHA-1: 7ab6962d5ca84ed418e5780341d245adca23f75b SHA-256: fd80eecdcdc1f19d22b8bb924e5c14478b3b4f9c514ab6ec6d397e5b9c1479bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file utilizes a link farm strategy, embedding numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute a malicious payload. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ccforum.kr/uploads/file/1621602101.pdf In PDF document text
    • http://brianhaymore.com/images/e/file/zepatemotavoretaduja.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/panudotenakumubafotiwa.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/xefuwebed.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6732a33b---nevovijaxojaf.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107e3cc9e973---35139914752.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/35429baf648a624063abb9f09a158578/garexovuwasivemexifufo.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/vamufaliruzule.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/291197f9f486f40a3680fe0d1d7cc3c3/81412952997.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6744496c2---58603563023.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/vikazijikejerome.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763b30c3720---32242844832.pdfIn PDF document text
    • http://geose.ru/userfiles/file/80644039143.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e986567de9e---55178402667.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/21034667511.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b404205c20d---96347052044.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jufobonizudogakefugetefa.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed0853ea61a2278f2b7146901426edd6/kobewogitupama.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607610991b876---jevato.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/131558546248.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/xikujazavikosuro.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/desisoxamunote.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210802_014943.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079533556603---96165763146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kalender+2018+pdf+din+a3PDF 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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 10768 bytes
SHA-256: a48ccd6e01e66598dd91a92737c5c08ca497cd0ae6fc45bcea401631b1f8522e
font_01_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 19108 bytes
SHA-256: fd16586ecec439fcb62a9b6c6ac37ffef633da6ff5a949c61830a1c019c3d881
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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