Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62e85d82af1709e…

MALICIOUS

PDF

101.1 KB Created: 2021-07-29 09:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdfa11af604d4f1f19aa94ec28388d87 SHA-1: b8bbacb6e4ea3c0e392e08370977c9fc460ac562 SHA-256: a62e85d82af1709ee06e7327ac53e1f57392ba97996f6af71e8c62d7d89d2611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings point to the document's primary function being to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://thefencedocumentary.com/adminfiles/file/gixanotoxixexopexesa.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab8214189---53901355838.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160777f5eef38e---34143796513.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/wedomefuzukov.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jelugowesajexodosomabi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/29122093693.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/medivepitetinoveloruta.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/96825381887.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/29294593820.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a86849c7---texurozexutuva.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hp84i34mfju7dlau4e6qnovuas/73324709087.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/lubafajasiwusa.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lipone.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3831c81b---37406847575.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd2fa5d1c---94295079892.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xivasaden.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b6b225cf---fejokubijowigogesopik.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/veeduf2rtc6sverquc68jbh234/fitikowulogugizodofubesor.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/nurodu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/80408067371.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb43098811---1412180122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56b54de86d---gixojewa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4733c92942---gejugejadumujurutefajone.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44355eca2f---pusarakanivipegapux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=data+science+from+scratch+2nd+edition+downloadPDF 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_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10948 bytes
SHA-256: de393a97b5ff45f925ac6c4cc7516b5fe77722297c923664586f2e60c152560a
font_01_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 17848 bytes
SHA-256: 6986e3517dc81a980a22ee13c5a0f7f3de0c709db3375699e497b30cfe62b5f6
font_02_sfnt_off00016d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1