Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca6721f89234b41…

MALICIOUS

PDF

78.6 KB Created: 2021-08-10 22:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59fdafb4954a9a5edb504b7123833c2b SHA-1: 655cdd748ab4a1d9f730a2fd98596e26beac5f14 SHA-256: dca6721f89234b41071485aef110e116ff74a1fad4e2347e4386e0b65b807c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', and an ML classifier also flagged it as malicious. The presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kanizsakran.hu/userfiles/file/piwarabijisenifogezidi.pdf In PDF document text
    • https://limpiezasinasel.com/userfiles/files/suzubevixelexane.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/177e31b3bfd9ebdfe28ae6b8c23c404f/wivomidatitodinisude.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a509a92570666b792f7cad0f1d9ab776/fuzewar.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/dogumobefixufidopatitamu.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/lafozizewat.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/fusutogenejetuwaka.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/dalepuxelejadevomopo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jatuwosawasobu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b12cbc834---dokazigogese.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fbdc0ac919b4de7b4ee48db87fe1e3d2/93570085996.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f4aab487a---luvemisisa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160712e111b696---2223604399.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/70252194761.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/poziwavagoluxilipazer.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210717094927.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/73099269165.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdd2afb59---wuvumotifadawogajetex.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ec65khv4sr3vqil72c9trlp4n/ramanometo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/21q44v4vn37848n8d1j1qsrodr/zolevuninalozi.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/24534142452.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8cd6eb68---vepusejot.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02565dbfc---siguju.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de16aa8aafc---fegepozutadim.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/8553408021.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/49820949425.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kq4spku15mrn0edmf97ur0qc12/tafisovepurevegosapamej.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210531032653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kenmore+elite+smartwash+quiet+pak+9+specsPDF 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_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 11220 bytes
SHA-256: 6d34a9c0f03d03d048e77f75afab906441b19a72e521d842daaa5ca8ab8ae6a2
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16492 bytes
SHA-256: 2da7760c9f77f0493ed81c65f6f5802d0e60ba811908b7c0fc143da7261c2664

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