Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a7d256326f2545…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49b1c7d6833ca1e09c3de549b0097e97 SHA-1: 64401fda8e597450acdebbc5516e51f3da53448f SHA-256: 80a7d256326f2545c90b5354c56e941e1c25d33bd16cf128d9305d03a94b9b09
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing malicious files or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://timandlor.com/userfiles/file/zafetado.pdf In PDF document text
    • http://mateuszkucharski.pl/admin/file/gasufawaletokejexo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/50720526950.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tegabigiromaxumilimibuji.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a00e749---5173007535.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/58865025172.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/pamusuzanamipulowumol.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/fivasusedixa.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/dutosexulatutagudulewamok.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/80290160994.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/gebuwukurezutiv.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ab95237c8e2082b2b9e9e8dee45786dd/gijobapa.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/puverunibotipeba.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/pijonuni.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/90491004757.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/pametudiw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144aaac4cbbd---sozefalufurepafivanuzize.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/velavefog.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/56959866498.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/regafekovamifividusasoxat.pdfIn PDF document text
    • https://projetovm.com/uploads/files/4748361492.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vekutazepu.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907194751.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/lixatevisumumosasijaneni.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/jusejakigej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kinemaster+video+editing+software+for+pc+free+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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 11108 bytes
SHA-256: 16c56ca4fcdeaea03d719f3a7106e809066b799285370a3d017cbc650b3efb62
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 17452 bytes
SHA-256: 1cc003d33d270c78f969f059c5f83f1438a907eaa96ff992d9721cfa5b7be194
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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