Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cab92025679812…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 05:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f6404bcae1abf5885c22d5af22f64b0 SHA-1: c81b8f514192cce9129c7e34d2e79e97f38cb830 SHA-256: d9cab92025679812ecca5a5ae923a8dd62cc159137a37399483d257165dfd3d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with spearphishing campaigns designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sikahaiphong.com/images/news/files/taxivoz.pdf In PDF document text
    • https://pioneerlift.com/upfiles/editor/files/jumijan.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/dawexujoz.pdfIn PDF document text
    • https://yifff.se/userfiles/file/63254616229.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/58838543109.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f431935---kuwidebazezutenerifil.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/kalavujisomesa.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/13127842307.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/tovivevotimube.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/60175138372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130903b72464---95859090603.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wizuzidonasogumojekule.pdfIn PDF document text
    • http://vce34.ru/attachments/file/venuzejodej.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/tesolip.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74180857273.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/42187104339.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/69505134624.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xorusamibukanivuzimi.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/zamoganutifakuwopu.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/28884662220.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613995c11df73---43184718287.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/vasamo.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/32747347317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ps+mobile+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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 17392 bytes
SHA-256: b2731759267d7d85430171564ddb25aa4eb0268108398fd65c464a7c6e1dc37d
font_01_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 10344 bytes
SHA-256: c68c3e8a0e0e9c3b64419b884f7a5482d51a554389136b6f39f71be1c05c5ed2

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