Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02d2d70773b4b4f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 22:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 196199ec9241d978b79587b5f7118acc SHA-1: 8a6db369c56b0bdc2e139164512ea89e83ac7506 SHA-256: a02d2d70773b4b4fd2881a8d2ea5610700cedf71c488149e915c7462544cde4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kientrucsangtrong.com/plus/files/likuw.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vmc8ra3vpgfm6s58eepiu0sim1/viderunilinogadufuba.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/98538549522.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dalelatakadegixoki.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd90dd49---mirufodimeramaninuxep.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/xawimibivoxawonefi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b15d8504---vamog.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-7/20210807082451282818.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wivibafisowutojimoxubewe.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/77371354379.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d4233d25---80539263103.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2ofno4icu4j994idd8fdij67f6/gojuk.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zufida.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gilapujiwonedi.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/wanuzavunipuv.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a22ialq5jeov1a005qcr3p0b20/puziril.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f786e0057a---85470203559.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/libuvozi.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/famabovobigilim.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/92604713336.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fodixetumaxazamu.pdfIn PDF document text
    • https://anfauglir.com/images/file/wanozolepajenuze.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/jawilimozunod.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/javazejetod.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/6722835870.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/46333865646.pdfIn PDF document text
    • https://5uempat.com/contents//files/35224441359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=asmaul+husna+untuk+anak+pdfPDF 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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 10492 bytes
SHA-256: 40708fb68f237ffdeed644f568c207da832e56e0761f68779bd0e10b32cb3b3a
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 20432 bytes
SHA-256: df7611d34280f97473840be93427f1c6aac7fc2d39fdaa0edd76c7455bb75052

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